Understanding Boldface Reasoning - GMAT Verbal

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Question

Some analysts predict that next year will see total worldwide sea shipping tonnage increase by 2% over the current year. However, captains of freight ships generally expect that worldwide shipping tonnage will decrease next year. At issue is the amount of freight that will be shifted from sea ships to freight airplanes as compared to growth in the overall demand for freight transport. The analysts believe growth in demand will outstrip the shift to freight airplanes; the ship captains believe the opposite.

The two portions in boldface play which of the following roles?

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Answer

The question stem, “The two portions in boldface play which of the following roles?”, clearly indicates this is a “Roles in Boldface” question, a subtype of the Method category. In order to successfully answer this question, we must analyze the “big picture” of the argument, focusing on structure, not topic. The correct answer will describe the function of the two bolded statements within the argument. Stepping back to look at the entire argument independent of its contextual context provides an insight into what role each piece plays. In essence, the argument states: “Some people believe X. Other people believe Y. The reason they disagree is Z. Some people believe X; the other people believe Y.” Because “Roles in Boldface” questions often contain overlapping answers, these questions are susceptible to process-of-elimination techniques. By correctly categorizing one of the two bolded statements, we can often eliminate more than one answer choice. The second bolded statement (“The reason they disagree is Z”) is likely the easier one to evaluate because it is distinctly different from the rest.

Looking down at the answer choices, “The first portion is evidence that supports a position; the second portion is a position that is not necessarily true based on the evidence.” and “The first portion represents one of two opposed positions; the second portion represents the opposing position.” both call the second bolded statement “a position” of one of the two groups. “The first portion represents one of two opposed positions; the second portion is evidence in support of that position.” and “The first portion is evidence that supports a position; the second portion is evidence that supports an opposed position.” call it “evidence in support” of a position. Only “The first portion represents one of two opposed positions; the second portion describes the underlying reason for the difference in position.” correctly identifies the second portion as the underlying reason for why the two groups disagree. We can actually eliminate four of the five answers without needing to evaluate the first bolded statement. The answer must be “The first portion represents one of two opposed positions; the second portion describes the underlying reason for the difference in position.”.

Just to check ourselves, we can evaluate the first statement to see if it fits (“Some people believe X.”) The first statement is clearly a statement of one of two positions, so it matches perfectly with “The first portion represents one of two opposed positions; the second portion describes the underlying reason for the difference in position.”.

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