听力原文：M: Are you the head resident？
W: Yes.
M: I'm Bill Miller. I'm here because I want to change roommates.
W: Really？ That surprises me. I thought that you and David were good friends.
M: We were. You see, we knew each other before. We are from the same home town, but it looks like we had different reasons for coming to college.
W: How so？
M: Well, David is really into having fun, which is great. But he has so many people in our room all the time that I can't study. And the stereo is on constantly.
W: Have you talked to him about it？
M: Yes, but he just doesn't take me seriously.
W: I see.
M: Miss Todd, I have to study. I'm on scholarship. David isn't.
W: Okay. Here's what we can do. Let me talk to David, and then you see how it goes. Just one week.
(20)

A. The man wants to get authorization for a room change.
B. The man is worried about his friendship with his roommate.
C. The man needs a scholarship to continue living in the dormitory.
D. The man wants the head resident to talk to David for him.