【正确答案】 C

【答案解析】此题属于语意搭配题。选项[C]said在此处表示“据说，据报道”，用法为It is said that...或sb．is said to do sth．，例如：It is said that he was a singer when he was young．也可以说成：He was said to have been a singer when he was young．上文提到公众开始关注收买证人这一话题，此处意在说明原因(据传有19位证人夸大其词)，故[C]符合上下文的意思。选项[A]stated表示“陈述，表明”，例如：Please state your name and address．选项[B]remarked表示“说，评论”，例如：remark on the new film。选项[D]told表示“告诉”。此三个选项都没有“据说，据报道”的意思。