---Jack, you seemed _______ at the party.

---You must be kidding. I felt _______ among those successful people.

A. confident; out of B. nervous; out of shape C. relaxed; out of place

C

句意：——杰克，你在聚会上看起来很放松。——你一定是在开玩笑，我在那些成功人士中间感到不自在。根据答语You must be kidding.可以判断上文是说在聚会上看起来很放松，“放松”这里应用relaxed；而后面I felt _______ among those successful people. 我在那些成功人士中间感到______，由前面说“你一定是在开玩笑”，可知此处应是说感到不自在，felt out of place表示感到不自在，故答案选C。