<p>Blue Book, Section 5, page 405, Q19.</p>
<p>The three levels discussed in lines 57-81 ("A glimpse . . . forces") serve primarily to
(A) present several arguments in support of a fundamental claim
(B) organize the author's opinions from most to least important
(C) illustrate a process of reasoning from initial assertion to ultimate conclusion
(D) group hypotheses that address two opposing principles
(E) compare alternative theories proposed by the scientific community</p>
<p>I said (C), but the answer's (A). I don't understand why (C) isn't right. The author asserts his point ("...at least three different levels"), then each paragraph shows the three levels (reasoning) before concluding his views in a final paragraph.</p>