参考答案

正确答案：C
解析：本题考查概括归纳能力。文中第七段第二、三句：Some were relatively minor，such as agreeing with the person with whom they were speaking that they liked someone when they really did not．Others were more extreme，such as falsely claiming to be the star of a rock band．句意如下：有些谎撒得相对要小一些，比如虽然他们并不喜欢某一个人，但是他们去附和赞同对方，说喜欢他。有些谎言则编得过大，比如谎称自己是某摇滚乐队的明星。据此分析，可知参与者撒谎时是在比较为难、陷入僵局的时候，所以C项符合题意。