The passage as a whole functions primarily as

Zahra on July 4, 2018

Why C and not E

Why is E not the answer? I thought "innovative methods of investigation" meant the new technological advances and "the hypotheses advanced" are the new information they've found. Thank you for all the help!

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Christopher on July 6, 2018

@Zahra, the biggest reason that (E) is wrong is that it says that discussing various hypotheses is the purpose of the passage while the passage deals almost entirely with methods, so the purpose of the passage can't be to discuss a variety of hypotheses.

Rossalyn-Delfino on September 6, 2018

Why is it C and not A? How can you tell it's an "account" of something versus a "defense?"