“Apt” means appropriate, right, and correct for a given situation, so "appropriate" is the correct answer. As for the other answer choices, “applicable” means able to be applied or related to a situation or circumstance; “explicable” means able to be explained; "jarring" means sudden and shocking or rattling and jolting; and "dull" means blunt and not sharp or boring.

When something is ambiguous, it is not distinct. For example, someone might shrug his or her shoulders. This action may indicate either not caring or meaning that the person is okay with what was said (or perhaps something entirely different). Such a gesture is thus said to be "ambiguous," for its meaning can go many different ways. (The word comes from roots that mean driving or going both ways at once. You might know the ambi- prefix, which means both. It is related to the word ambidextrous, which means using both hands ably.) Thus, the best option among those provided is imprecise. When something is "precise," it is exact. The "im-" prefix here is what is called a "privitive prefix." It is a prefix that means not. Therefore, "imprecise" means not precise—quite like being ambiguous!

"Covert" means hidden or undercover. Spies often go on covert operations which means that it is a secret operation. "Visible" means able to be seen. "Blanket" is a concrete noun referring to a cloth object used as a cover for warmth. "

Look at your answer choices--how would you categorize the words? "Indeterminate," "ambiguous," and "blurry" all refer to something that is not easily known, understood, or perceived. "Relatable" means that you can easily relate to or connect with that that person or thing. "Deliberate" means that there is a clear intention to the action described; in other words, it is "intentional."

"Painstaking" means done with great care and patience, meticulous and careful. To provide further help, "hapless" means hopeless, unfortunate, unlucky. 

A "hazard" is a danger, so something that is "hazardous" is dangerous. To provide further help, "unnerving" means troubling, worrying; "urging" means begging, pleading.

For the word particular, do not be confused by the "part" portion of the word. The word "particular" is not primarily concerned with being a part (in contrast to being a whole). Instead, something is particular when it is specific. For example, whenever you say, "I have a particular color in mind," this means that you actually have a specific color picked out. You are not undecided. Thus, the best option given here is "distinct."  Something that is particular is also distinct. The word can also be used to describe someone who is very picky.  A person who is "very particular" is very picky—he or she wants something very distinct. 

Whenever something is "hilarious," that thing is very funny. For this question, the best option will stress the very. That is, the best option will be one that expresses the idea that a hilarious thing is not merely "amusing" or "funny." It is, instead, "hysterical"—very amusing.

Whenever something is "enticing," it draws your attention and makes you desire it. Sometimes, we talk about one person enticing another person to do something or go somewhere. Whenever someone or something entices you, it "invites" you to come closer to it. Put another way, we can say that it "attracts" you. Hence, "attractive" is a good synonym for "enticing."

Whenever something happens "occasionally," it does not happen on a regular schedule. It is an irregular occurrence. Hence, you could say, "Rupert's occasional remarks about politics annoyed his family, but they were thankful that he didn't talk about the topic much." To be "occasional" is to happen "only on occasion." (Related words help us to memorize, of course!) Thus, the only option that expresses this idea of being irregular is "random."