ACT English Quiz: Semicolon Colon And Dash
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Semicolon Colon And DashQuestion 1 of 20

A student council committee planned a fundraiser and needed to assign tasks quickly. Priya wrote a clear message to the group so no one would forget what to bring. Her note read, Please bring the following items: posters, markers, and tape. Which choice makes the sentence most grammatically acceptable?

Please bring the following items—posters; markers; and tape.
Please bring the following items; posters, markers, and tape.
Please bring the following items, posters, markers, and tape.
NO CHANGE
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ACT English Quiz

ACT English Quiz: Semicolon Colon And Dash

Practice Semicolon Colon And Dash in ACT English with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Semicolon Colon And Dash, giving you a quick way to practice the rules, question types, and explanations that matter most for ACT English.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A student council committee planned a fundraiser and needed to assign tasks quickly. Priya wrote a clear message to the group so no one would forget what to bring. Her note read, Please bring the following items: posters, markers, and tape. Which choice makes the sentence most grammatically acceptable?

  1. Please bring the following items—posters; markers; and tape.
  2. Please bring the following items; posters, markers, and tape.
  3. Please bring the following items, posters, markers, and tape.
  4. NO CHANGE (correct answer)

Explanation: This question tests how to introduce a list. 'Please bring the following items' is a complete independent clause, and the phrase 'the following' promises that a list is coming, so a colon is the standard mark, which is why the version reading 'Please bring the following items: posters, markers, and tape' is correct, with commas separating the three items. The version using a semicolon misuses that mark, since semicolons join independent clauses or separate list items that already contain commas, not the introduction from the list. The comma version is too weak after a full clause and blurs the boundary, making 'items' look like the first entry in the series. And the version with a dash plus semicolons between 'posters,' 'markers,' and 'tape' badly over-punctuates simple items.

Question 2

A travel writer drafted an article about taking the ferry to a small island. The draft emphasized how quickly the mood changed once the boat left the dock. One sentence reads, The wind picked up everyone pulled their jackets tighter. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE
  2. The wind picked up: everyone pulled their jackets tighter.
  3. The wind picked up; everyone pulled their jackets tighter. (correct answer)
  4. The wind picked up, everyone pulled their jackets tighter.

Explanation: The underlined sentence runs two complete thoughts together — "The wind picked up" and "everyone pulled their jackets tighter" — with no punctuation between them, which makes it a run-on. Two independent clauses need a proper connector, and the version that inserts a semicolon supplies one: a semicolon joins two closely related complete sentences without a conjunction, and each half here can stand on its own. Leaving the sentence unchanged keeps the run-on, so it cannot be correct. The version that inserts a comma produces a comma splice, because a comma by itself is too weak to join independent clauses. The version that inserts a colon does not fit either, since a colon should introduce an explanation, definition, or list that the first clause sets up, and this second clause simply reports what happened next.

Question 3

PASSAGE II: The Ghost in the Machine

¹ In 1920, a Russian physicist named Leon Theremin was conducting experiments with high-frequency oscillators when he noticed something strange. As he moved his hand near the (11) equipments circuits, the pitch of the audio signal changed. Theremin realized he had stumbled upon a completely new way to produce sound. He quickly adapted his laboratory apparatus into a musical instrument. It was officially named the aetherphone, but it soon became known simply as the theremin.

² (12) Unlike a piano, a guitar, or a flute, the theremin is played without physical contact. The instrument consists of a wooden box featuring two metal antennas: a vertical one on the right and a horizontal loop on the left. (13) The vertical antenna controls pitch, while the horizontal loop controls volume. As the player's hands move closer to or further from the antennas, they alter the electromagnetic fields surrounding them. This interference is translated into electrical signals, which are then amplified through a speaker.

³ Playing the theremin requires intense concentration and absolute physical control. Because there are no keys, frets, or strings to guide the musician, relying entirely on "muscle memory" and a flawless ear for relative pitch (14) is required. A tremor in the performer's hand, a shift in posture, or even a deep breath can unintentionally alter the pitch. (15) Many people try to play the theremin and give up after a few days.

⁴ When Leon Theremin demonstrated his invention to the public in the 1920s, audiences were mesmerized. The musician stood behind the box, waving their hands in the air like an orchestra conductor, (16) coaxing out ethereal, trembling melodies. (17) The sound was often compared, by critics, to a human voice singing a wordless, mournful tune. Classical composers began writing concertos specifically for the instrument.

⁵ Despite its initial popularity, the theremin was ultimately too difficult for the average person to master, so it never became a household instrument. (18) However, it found a second life in Hollywood. In the 1950s, film composers realized that the theremin's eerie, otherworldly wail was the perfect soundtrack for science fiction and psychological thriller movies. Whenever a flying saucer landed on screen or a character experienced a cinematic mental breakdown, the theremin was there to provide the sonic backdrop.

⁶ Today, the theremin is enjoying a modern resurgence. Contemporary artists use it to add a vintage, atmospheric layer to rock and electronic music. Though synthesizer technology has made it incredibly easy to produce identical sounds digitally, the physical magic of the theremin, (19) the act of pulling music out of thin air—remains utterly unique.

Which of the answer options below makes the sentence most grammatically acceptable?

  1. NO CHANGE
  2. the act of pulling music out of thin air, remains (correct answer)
  3. the act, of pulling music out of thin air—remains
  4. the act of pulling music, out of thin air, remains

Explanation: The phrase "the act of pulling music out of thin air" is a nonessential appositive renaming "the physical magic of the theremin," so it must be set off with matching punctuation on both sides. Choice B correctly replaces the dash with a comma so that the appositive is properly enclosed by commas. Choice A retains mismatched punctuation (a comma before the phrase and a dash after it), which is grammatically incorrect. Choice C incorrectly places a comma between "act" and "of," separating a noun from its prepositional phrase. Choice D introduces unnecessary commas that incorrectly divide the prepositional phrase "out of thin air."On the ACT, nonessential appositives must be enclosed with consistent punctuation marks.

Question 4

In a lab report, Sam described the steps his group used to test water quality in a nearby creek. They collected samples upstream, midstream, and downstream, then compared the results. Sam wanted to introduce an explanation of what the numbers suggested, so he wrote, The results were consistent: the creek was cleaner upstream than downstream. Which choice makes the sentence most grammatically acceptable?

  1. The results were consistent, the creek was cleaner upstream than downstream.
  2. NO CHANGE (correct answer)
  3. The results were consistent; the creek was cleaner upstream than downstream.
  4. The results were consistent. the creek was cleaner upstream than downstream.

Explanation: This question tests punctuation between two independent clauses when the second one explains the first. 'The results were consistent' is a complete clause that raises a question, consistent how, and the version keeping the colon before 'the creek was cleaner upstream than downstream' answers it. A colon is the right mark after a full clause when what follows spells that clause out, which matches Sam's goal of introducing an explanation. The version with a semicolon is grammatical, since both halves are independent clauses, but a semicolon only signals that ideas are related, not that one explains the other, so the colon fits better here. Joining the clauses with a comma creates a comma splice, and the version with a period fails to capitalize the word that begins the new sentence.

Question 5

At a cooking class, the chef demonstrated how to make a simple tomato sauce taste richer without adding more salt. She toasted spices in oil, simmered the tomatoes slowly, and finished with a small amount of butter. Then she explained the reason for the method: heat releases aroma compounds, which changes how the sauce tastes. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ;
  3. ,
  4. .

Explanation: This question tests the use of colons to introduce explanations or reasons. The clause 'Then she explained the reason for the method' is independent and introduces what that reason actually is. A colon correctly follows this independent clause to introduce the specific explanation of why the method works. The colon signals that what follows will provide the reason mentioned in the main clause. A semicolon would be incorrect because the second part explains rather than forms a parallel independent clause. A comma would create an improper structure, and a period would separate the setup from its explanation.

Question 6

When the hiking club planned its weekend trip, the leaders considered distance, elevation, and weather. They also checked whether the trail had reliable cell service and a clear turnaround point. The final email listed what members should bring, water, a headlamp, a map, and a small first-aid kit to avoid delays at the trailhead. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE
  2. ;
  3. : (correct answer)
  4. .

Explanation: This question tests the use of colons to introduce lists or specific items. The clause 'The final email listed what members should bring' is independent and introduces a specific list of items. A colon correctly follows this independent clause to introduce the enumerated list of required items. The colon signals that what follows will specify exactly what should be brought. A comma creates an incorrect grammatical structure for introducing a formal list. A semicolon would be inappropriate since this isn't connecting two independent clauses, and a period would create a sentence fragment.

Question 7

The concert was phenomenal: the musicians played with passion and energy. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. , the musicians played with passion and energy.
  3. ; the musicians played with passion and energy.
    • the musicians played with passion and energy.

Explanation: This question tests colons used to introduce explanations or elaborations. The clause 'The concert was phenomenal' is independent and complete, and the colon properly introduces an explanation of why the concert was phenomenal. The second part 'the musicians played with passion and energy' elaborates on the quality described in the first clause. Choice B creates a comma splice by connecting two independent clauses with only a comma, choice C uses a semicolon which would work grammatically but doesn't show the explanatory relationship as clearly, and choice D uses a dash which is less formal than the colon. Colons are ideal for introducing explanations that elaborate on the preceding independent clause.

Question 8

For the student newspaper, Amir profiled a local baker who donates day-old bread to shelters. The baker starts mixing dough at 3 a.m., then opens the shop by sunrise. Amir wanted one line that captured the rhythm of the work: the ovens roar all morning; customers arrive in waves, and the staff keeps smiling.

Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. the ovens roar all morning, customers arrive in waves
  3. the ovens roar all morning: customers arrive in waves
  4. the ovens roar all morning—customers arrive in waves

Explanation: This question tests punctuation between independent clauses in a compound sentence. The sentence contains three independent clauses: "the ovens roar all morning," "customers arrive in waves," and "the staff keeps smiling." The semicolon in choice A correctly separates the first two independent clauses, while the comma before "and" properly connects the third clause. Choice B (comma splice) is incorrect, C (colon) doesn't fit because the second clause doesn't explain the first, and D (em dash) would work but changes the emphasis. The semicolon maintains the parallel rhythm of the bakery's workflow.

Question 9

Nadia trained for a 5K by running after school on the track behind the gym. She kept her pace steady, but she also paid attention to how she felt at different points in the workout. Over time she learned to adjust her breathing before she got tired, not after. On race day she remembered her coach's advice: start slower than you think you should.

Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ; start slower than you think you should
  3. , start slower than you think you should
  4. . Start slower than you think you should

Explanation: This question tests the use of a colon to introduce quoted advice or an explanation. The phrase 'she remembered her coach's advice' is an independent clause that sets up what follows. A colon is the ideal punctuation here because it introduces the specific advice that the coach gave: 'start slower than you think you should'. A semicolon (choice B) would incorrectly suggest two independent clauses of equal weight, a comma (choice C) cannot introduce quoted material after an independent clause, and while a period (choice D) is grammatically correct, it loses the direct connection between the setup and the advice.

Question 10

After weeks of rehearsals, the jazz ensemble finally played the piece at the winter concert. The drummer kept the tempo steady, and the pianist signaled each transition with a quick glance. Still, the saxophonist felt nervous before the solo section. Then the moment arrived—and the first note came out clear and strong.

Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ; and the first note came out clear and strong
  3. : and the first note came out clear and strong
  4. , and the first note came out clear and strong

Explanation: This question tests the use of an em dash to create dramatic emphasis. The sentence builds tension with 'Then the moment arrived' and the em dash creates a perfect dramatic pause before the resolution 'and the first note came out clear and strong'. The em dash is ideal here because it mirrors the brief pause before the saxophonist begins playing and adds emotional weight to the moment. A semicolon (choice B) would be too formal and suggest two equally weighted clauses, a colon (choice C) would be overly formal for this narrative moment, and a comma (choice D) would be too weak to capture the drama. When showing a dramatic turn or emphatic moment, em dashes are more effective than other punctuation marks.

Question 11

During a community science night, Maya explains how her team tracked moths in a city park. They recorded the temperature, the time of day, and the number of moths near each lamp. The data were messy at first, but a pattern emerged. Maya summarized their conclusion in her report: Warmer evenings brought more moths; cooler evenings brought fewer. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. Warmer evenings brought more moths, cooler evenings brought fewer.
  3. Warmer evenings brought more moths: cooler evenings brought fewer.
  4. Warmer evenings brought more moths. cooler evenings brought fewer.

Explanation: This question tests the use of semicolons to join related independent clauses. The sentence contains two independent clauses: 'Warmer evenings brought more moths' and 'cooler evenings brought fewer.' Each clause can stand alone as a complete sentence with its own subject and verb. The semicolon in choice A correctly connects these closely related ideas without needing a coordinating conjunction. Choice B creates a comma splice error, choice C misuses a colon (which requires what follows to explain or elaborate on what precedes it), and choice D incorrectly capitalizes after a period. When two independent clauses express contrasting but related ideas, a semicolon provides the perfect punctuation to show their connection.

Question 12

In a short memoir for English class, Jordan describes learning to cook with his grandfather. The lesson moved quickly from chopping onions to timing the pasta, and Jordan tried to keep up. He wrote, My grandfather had one rule: taste the sauce before adding salt. Which choice makes the sentence most grammatically acceptable?

  1. My grandfather had one rule; taste the sauce before adding salt.
  2. NO CHANGE (correct answer)
  3. My grandfather had one rule, taste the sauce before adding salt.
  4. My grandfather had one rule—taste the sauce before adding salt.

Explanation: This question tests the colon as a way to introduce something the first part of the sentence has promised. "My grandfather had one rule" is a complete independent clause that raises an obvious question, what rule, and the version keeping the colon before "taste the sauce before adding salt" delivers the answer, which is exactly a colon's job. The version with a comma cannot do that work: a comma is too weak to introduce the rule and creates a splice. The version with a semicolon presents the two parts as separate coordinate statements rather than as announcement and content, which loses the link between them. The dash version is grammatically acceptable, but a dash reads as an informal aside, while the colon formally names what was promised.

Question 13

"Turn Right at the Big Pine"

My father believed that road maps were for people who lacked a sense of adventure. He preferred to navigate by instinct, landmark, and the occasional contradictory tip from a gas station attendant. Consequently, [19] our annual family trips to the Cedar Creek campground were rarely straight lines; they were sprawling, improvisational loops through the backroads of Oregon.\n\nI was ten years old, sitting in the backseat of our station wagon, squeezed between a cooler full of soda and my sleeping brother. The air outside was thick with the scent of pine and dust. We had been driving for six hours, [20] but according to Dad, we were "just around the river bend." He pointed to a massive, gnarled tree standing sentinel at a fork in the road. "That's the Big Pine," he declared with the confidence of a ship captain spotting land. "We turn right here."\n\nWe turned right. The pavement immediately gave way to gravel, and the road narrowed until the blackberry bushes were scraping the sides of the car. My mother, who had been quietly reading a novel, looked up. "Honey," she said, her voice dropping an octave, "I don't think this is the way to the campsite." Dad waved a hand dismissively. He insisted that this was a shortcut he had discovered years ago. [21]\n\nTen minutes later, the road ended abruptly at a rusted gate marked "Private Property." A cow stared at us blankly from the other side. Silence filled the car. The cow chewed its cud, looking entirely unimpressed by our arrival. [22] Without a word, Dad shifted the car into reverse. As we backed down the dusty trail, he caught my eye in the rearview mirror and winked. "Well," he said, "now we know what's down that road." For him, the wrong turn wasn't a mistake; it was just another part of the story. [23]\n\n[1] We eventually found the campsite, arriving just as the sun was setting behind the mountains. [2] I realized then that the destination mattered less to him than the wandering it took to get there. [3] Years later, when I drive [25] my own kids on vacation, I keep a GPS on the dashboard. [4] But sometimes, when I see a strange road winding off into the trees I feel [24] a familiar tug to turn the wheel."

In Sentence 4 of Paragraph 5, the writer wants to use punctuation to create a dramatic pause before the final thought. Which version of the sentence best achieves this?

  1. ...winding off into the trees, I feel a familiar tug...
  2. ...winding off into the trees; I feel a familiar tug...
  3. ...winding off into the trees—I feel a familiar tug... (correct answer)
  4. ...winding off into the trees I feel a familiar tug...

Explanation: This is a semicolon, colon, and dash question testing punctuation for stylistic effect. You can tell because the question explicitly states a rhetorical goal ("create a dramatic pause") and the only differences among choices are punctuation marks between two independent clauses. You must select the punctuation that achieves the specific stylistic effect requested. For punctuation style questions, understand the effects of different marks: commas create gentle pauses, semicolons create balanced/formal pauses, colons introduce explanations/lists, and dashes create dramatic pauses or sudden shifts. When the ACT asks for "dramatic pause" or "emphasis," the dash is almost always correct. Dashes are the most emphatic punctuation mark. Choice C (...winding off into the trees—I feel a familiar tug...) is correct because the em dash creates a dramatic pause and emphasizes the sudden emotional shift from external observation ("strange road") to internal feeling ("I feel a familiar tug"). The dash signals an abrupt break in thought, which creates the dramatic effect requested in the question. Choice D (no punctuation) creates a run-on sentence—two independent clauses must be separated by some punctuation. "When I see a strange road winding off into the trees" is an independent clause, as is "I feel a familiar tug to turn the wheel." Actually, wait—"when I see" makes it dependent. Let me reconsider. Actually, looking at the full context: "But sometimes, when I see a strange road winding off into the trees I feel a familiar tug..." The "when" clause is dependent, so we need punctuation before "I feel" to separate the dependent clause from the main clause. Choice D with no punctuation runs the clauses together. Choice B (semicolon) is grammatically acceptable but creates a formal, measured pause rather than a dramatic one. Semicolons feel academic and balanced, not emphatic. Choice A (comma) would be grammatically acceptable for separating the dependent clause from the independent clause, but a comma creates a gentle pause, not the "dramatic pause" requested. The dash is far more emphatic. Remember: Dashes are your tool for drama, emphasis, and sudden shifts! The ACT will often ask for "dramatic pause," "emphasis," or "abrupt shift," and the dash is almost always the answer. Pro tip: Think of punctuation marks as having different "volumes." Comma = quiet pause. Semicolon = moderate, formal pause. Dash = LOUD, dramatic pause. Choose the mark that matches the rhetorical effect you need!

Question 14

In a workshop on personal finance, the instructor explained why budgets fail when they are too strict. She encouraged students to set realistic categories and to track spending for a month before making big changes. The key point was simple; a budget should describe your habits, not punish them. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ,
  3. :
  4. .

Explanation: This question tests the use of semicolons to connect independent clauses that elaborate on each other. The sentence contains two independent clauses: 'The key point was simple' and 'a budget should describe your habits, not punish them.' Both clauses can stand alone, and the second clause specifies what the simple point actually is. A semicolon correctly connects these related independent clauses where the second elaborates on the first. A comma would create a comma splice error, while a colon might seem tempting but is less appropriate when the second clause is a complete, parallel thought. A period would break the close logical connection.

Question 15

When the theater club rehearsed the final scene, the director reminded everyone to stay in character even during quick set changes. The actors practiced moving props quietly while the lights dimmed. One moment always drew attention, the lead actor paused, then whispered the last line as the curtain began to fall. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE
  2. — (correct answer)
  3. ;
  4. :

Explanation: This question tests the use of em dashes to set off dramatic or emphatic descriptive elements. The phrase 'the lead actor paused, then whispered the last line as the curtain began to fall' describes the specific moment that always drew attention. Em dashes are perfect for setting off dramatic descriptions or moments that deserve emphasis, especially in creative or theatrical contexts. A colon would be too formal for this vivid, dramatic description. A semicolon would be incorrect because the second part isn't an independent clause, and the current punctuation (comma) doesn't provide enough emphasis for this climactic moment.

Question 16

At the robotics competition, the team's first run failed because a loose wire disconnected the sensor. After a quick repair, the robot navigated the course smoothly and finished ahead of schedule. The coach offered one reminder—test every connection twice before the next round, even if the fix seems obvious. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ;
  3. :
  4. ,

Explanation: This question tests the use of em dashes to set off emphatic or interrupting elements. The phrase 'test every connection twice before the next round' serves as an emphatic elaboration of the 'one reminder' mentioned in the main clause. Em dashes are more dramatic than commas but less formal than colons, making them perfect for emphasizing important advice or warnings. A semicolon would be incorrect because the second part isn't an independent clause. A colon would be too formal for this context, and a comma wouldn't provide enough emphasis for this crucial reminder.

Question 17

In her chemistry lab report, Talia described the steps she followed to reduce measurement error. She calibrated the scale before each trial and recorded the temperature of the room. Her conclusion was straightforward: the data supported the hypothesis, but only within a narrow range of concentrations. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. ;
  3. ,
  4. .

Explanation: This question tests the use of colons to introduce explanations or elaborations. The first part 'Her conclusion was straightforward' is an independent clause that introduces what the conclusion actually was. A colon correctly follows this independent clause to introduce the specific explanation of her straightforward conclusion. A semicolon would be incorrect because the second part elaborates on rather than contrasts with the first. A comma would create an incorrect punctuation pattern, and a period would unnecessarily separate the introduction from its explanation.

Question 18

In a lab report about soil quality, Jenna described the supplies her team used before collecting samples behind the school. They packed gloves, jars, and labels, then checked the pH strips twice to be sure the colors were readable. She listed everything in one sentence: we brought three tools: a trowel, a sieve, and a small scale.

Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. we brought three tools; a trowel, a sieve, and a small scale
  3. we brought three tools, a trowel, a sieve, and a small scale
  4. we brought three tools—a trowel, a sieve, and a small scale

Explanation: This question tests the use of colons to introduce lists. The sentence structure is "we brought three tools" followed by a list of those tools. A colon must follow an independent clause and can introduce a list, explanation, or elaboration. Choice A correctly uses a colon after the complete thought "we brought three tools" to introduce the specific items. Choice B incorrectly uses a semicolon (which joins independent clauses, not introduces lists), C uses only a comma (creating a run-on), and D uses an em dash (which could work but is less formal than the colon for introducing a list).

Question 19

While preparing for a violin recital, Elena practiced difficult passages in short bursts rather than repeating the entire piece from start to finish. She recorded herself, listened for uneven rhythm, and adjusted her bowing. Her strategy had a clear logic; focusing on small sections prevented mistakes from becoming habits. Which choice makes the sentence most grammatically acceptable?

  1. NO CHANGE (correct answer)
  2. :
  3. ,
  4. .

Explanation: This question tests the use of semicolons to connect independent clauses that explain or elaborate. The sentence contains two independent clauses: 'Her strategy had a clear logic' and 'focusing on small sections prevented mistakes from becoming habits.' Both clauses can stand alone, and the second clause explains what that logic actually was. A semicolon correctly connects these related independent clauses where the second provides the reasoning for the first. A comma would create a comma splice, while a colon would be less appropriate for this explanatory relationship. A period would break the logical connection between the claim and its explanation.

Question 20

A museum volunteer wrote a description for a new exhibit on early photography. The label needed to list several processes without confusing visitors. The draft sentence reads, The exhibit highlights daguerreotypes; tintypes; albumen prints; and cyanotypes. Which choice makes the sentence most grammatically acceptable?

  1. The exhibit highlights daguerreotypes: tintypes, albumen prints, and cyanotypes.
  2. NO CHANGE
  3. The exhibit highlights daguerreotypes—tintypes, albumen prints, and cyanotypes.
  4. The exhibit highlights daguerreotypes, tintypes, albumen prints, and cyanotypes. (correct answer)

Explanation: This question tests punctuation in a simple series. Semicolons separate list items only when the items themselves contain commas, so the version reading "daguerreotypes, tintypes, albumen prints, and cyanotypes" is correct: four short items, commas between them, and "and" before the last. The version keeping semicolons after "daguerreotypes" and "tintypes" treats plain single nouns as though they were internally punctuated. The version placing a colon after "daguerreotypes" makes the remaining three processes look like a definition of that one term and leaves the verb "highlights" with a single object. The dash version has the same problem, setting off the final three items as an explanation of the first rather than listing all four equally.