F: Did you tell Carl that the concert will be starting late? ,M: I've tried several times, but his line has been busy.
(A) F: So your problem is you are not able to get through to Carl, right? (B) F: So your question is that the line for concert tickets is too busy, right? Then why don't you call Carl? (C) F: Your problem is that Carl is going to be late for the concert, but you haven't called him yet. (D) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that?
A