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Rotelle: You are too old to address effectively the difficult issues facing the country, such as nuclear power, poverty, and pollution.

Sims: I don’t want to make age an issue in this campaign, so I will not comment on your youth and inexperience.

7.     Rotelle is committed to which one of the following?

(A) Many old people cannot effectively address the difficult issues facing the country.

(B) Those at least as old as Sims are the only people who cannot effectively address the difficult issues facing the country.

(C) Some young people can effectively address the difficult issues facing the country.

(D) If anyone can effectively address the difficult issues facing the country, that person must be younger than Sims.（D）

(E) Addressing the difficult issues facing the country requires an understanding of young people’s points of view.

怎么分析A 跟C 的错误? 怎么得出的D的答案?

thanks

明白了