OE


The blank refers to class. The clue for the blank is purportedly an exhaustive study. The transition word yet indicates the word for the blank is the opposite of the clue, so use “not exhaustive” as a word for the blank. Choices (A), (B), and (D)— prudent, acceptable, adequate— can be eliminated because they do not match “exhaustive.” Choice (E), authoritative, means with authority, which does not match “exhaustive,” so eliminate (E). The correct answer is (C), comprehensive.