C. deal with 处理, 解决与标准答案不符。能否再仔细瞧瞧，帮帮忙咯。B. comment onThere are many different definitions for a public service announcement(PSA) or public service ad, but the simplified version of PSAs are messages in the public interest disseminated by the media without charge, with the objective of raising awareness, changing public attitudes and behavior towards a social issue.此段英语，对问答有什么帮助？为什么不选C？PSA 有许多解释, 此段英语，对问答有帮助所谈何物, 利於选择.既有标准答案, 就不必多此一举 !!