A main-idea choice repeats one true sentence from the passage word for word but contradicts the author's overall stance. Per ETS guidance on RC, the choice is
Acorrect, because the wording of the choice is supported verbatim by a sentence in the passage
Bcorrect, provided the stance that the choice contradicts only appears late in the body of the passage
Cincorrect, because main-idea correctness depends on answering the question posed, not on being a true line
Dincorrect, but only when the question stem uses the exact phrase 'main purpose' rather than 'main idea'
Answer & Solution
Correct answer: C. incorrect, because main-idea correctness depends on answering the question posed, not on being a true line
ETS warns: be careful not to pick an answer choice simply because it is a true statement. A main-idea choice has to answer the question posed (the passage's overall purpose), and a choice that contradicts the author's stance fails that test even if it quotes the passage verbatim.
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