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Parallel Flaw. The correct answer choice is (C).
The stimulus contains a source argument, also called an ad hominem attack - the author argues that a proposal should be accepted solely on the grounds that the people who oppose that proposal have some motive for opposing it, a motive that our author has a problem with. No evidence is offered to support the author's position other than citing the motive of the opposition. The stem tells us to find an answer that commits the same error in reasoning, so look for an argument that is entirely focused on the (supposedly bad) motives of the opposition and gives no other evidence to support the author's position.
Answer choice (A): This is a flawed argument, but the flaw is a complete lack of relevant evidence rather than an attack on the motives of the opposition. At no point does the author here suggest that those who oppose his idea have a bad motive, or that their motives have anything to do with why he believes what he says.
Answer choice (B): This argument never deals with the opposition, and it does give at least some relevant evidence to support its position, which was about the potential damage to the integrity of the historical record.
Answer choice (C): This is the correct answer choice. This is the argument that attacks the bad motive of the opposition (beauticians are motivated by financial gain to suggest more frequent haircuts), and on that basis alone says we should not do what those people say. A source argument, like the stimulus, and thus a match.
Answer choice (D): This argument is not based on the motives of the opposition, and in fact never addresses any opposing argument. Instead, this argument is "many people want us to do X, and we shouldn't alienate those people, so we should do what they want."
Answer choice (E): Plenty of evidence is offered in support of the conclusion, and no opposing argument is mentioned, nor are the motives of any potential opponent, so this is not parallel to the flawed argument in the stimulus.