—I think we should give up our jobs,sell the flat and travel

—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"