This is a boldface question. Read carefully for the structure of the argument. The first bolded statement is a claim made by the geologist. The second is the conclusion of the argument, which relies on that claim in the first bolded statement. You'll rarely be able to predict the exact words used in the answer choices, but once you've figured out how the bold statements function, you should be able to identify a choice that matches reasonably well. In this case, choice (E) is correct. Only (B) and (E) refer to the second statement as a conclusion; (B) mistakenly refers to the first statement as something weighing against the conclusion.