( B. They are not always accurate when it comes to recording their viewing habits , C. The indirect influence they exert on advertising costs may not be based on all relevant factors. )

The passage says that the percentage indicates the number of viewers watching, so choice (A) is not correct. The passage says that residences underreport daytime and late-night television viewing, so choice (B) is true. Finally, the passage says that gauging how attentive the audience is to … advertising is a nonviable practice. Because the first paragraph says that advertising rates are determined by the viewership, choice (C) is true. Attentiveness would be another relevant factor.

(B. dubious)

The author says the Nielsen Company has questionable methods and has come under criticism, and puts the word diaries in quotes as though to make fun of its methodology as quaint or clunky, so choice (B) is the best answer.There is no indication that Nielsen’s bias is intentional, so eliminate choice (A).Choices (C) and (D) are extreme because the passage does not suggest that Nielsen’s research is so bad as to be worthless or unscrupulous.The passage does not offer any information about Nielsen’s opinion of itself, boastful or otherwise, so eliminate choice (E).