—I think we should give up our jobs,sell the flat and travel around the world.If we don’t do it now,we never will.

问题描述:

—I think we should give up our jobs,sell the flat and travel around the world.If we don’t do it now,we never will.
— We’ve been talking about doing this for ages.
A.That’s true.B.That’s very kind.
C.Are you kidding?D.I’m only joking!
我选的C,觉得语气是"我们都说了好几年的这个话题了"

为什么要选C呢?感觉两个对话人说话的态度是一致的,没有出现转折.应该顺着说表示赞同.