F: Are you doing anything special this weekend? ,M: I wanted to go to the music festival in the National Park. But one of my friends invited me to her house for dinner. So I'm going to the dinner on Saturday night instead. What about you? Are you going to the festival? ,F: I was planning on going with my sister, but she got a phone call from her boss and found out that she has to work so she can't drive me there.
(A) M: So, you were planning on going by yourself, but the problem is your car has broken down? (B) M: So, your friend got a phone call from her boss and your problem is your  boss told you to work at weekends? (C) M: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (D) M: So, the problem is your sister can't drive you to the music festival as she got a phone call from her boss?
D