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555-605 Level|   Weaken|         
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Bunuel
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D because the chemist doesn't address the argument, but the person saying the argument. It's an ad hominem attack
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Physicist: The claim that low-temperature nuclear fusion can be achieved entirely by chemical means is based on chemical experiments in which the measurements and calculations are inaccurate.

Chemist: But your challenge is ineffectual, since you are simply jealous at the thought that chemists might have solved a problem that physicists have been unable to solve.

Which one of the following is the strongest criticism of the chemist’s response to the physicist’s challenge?

(A) It restates a claim in different words instead of offering evidence for this claim. - WRONG. Not reinstating the claim but taking the direction of the P's statement in other direction.
(B) It fails to establish that perfect accuracy of measurements and calculations is possible. - WRONG. Not about accuracy.
(C) It confuses two different meanings of the word “solve.” - WRONG. Irrelevant.
(D) It is directed against the proponent of a claim rather than against the claim itself. - CORRECT. Got personal.
(E) It rests on a contradiction. - WRONG. No contradiction is ascertainable as such.

Answer D.
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