Which of the Following Statements About Negative Ads Is MOST

Which of the following statements about negative ads is MOST accurate or least controversial?

A) Candidates generally prefer to leave attack ads to their supporters rather than engage in them directly.
B) Negative ads convey no information to voters that is useful in making up their minds.
C) Negative ads clearly depress long-term political participation.
D) The long-term effects of negative ads on political participation are minimal.
E) Negative ads are clearly more likely to attract undecided voters than to discourage their participation.