Yes, the correct answer is (E) "taking for granted that experts do not act counter to what, according to their expertise, is in their best interest." (D) is incorrect not necessarily because of the word "authority," but because the passage does not provide any information on authorities besides doctors. In order to claim that other authorities provide conflicting advice, we would need this information. Please let us know if you have any questions about this or would like a more thorough explanation.
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