听力原文：M: Hi, Sarah, what's up？
W: Oh, hi. I just got out of a history class. I had to give a presentation.
M: How did it go？
W: Terrible. I'm sure I made a fool of myself.
M: Why？ Weren't you prepared？
W: No, it's not that. I just get so embarrassed and nervous whenever I've to speak in front of a group of people. I stand up and my face gets red then I get even more nervous because I know everyone can see me blushing. M: It is not so bad to blush.
W: But it happens all the time. If the professor asks a question and I know the answer, I'll blush like crazy if he calls on me. Doesn't that ever happen to you？
M: No, not really. Maybe you should try to forget about the people. Look at something else in the room, like the exit sign.
W: I guess I could try that. But I doubt it will help.
M: You know we talked about this in psychology class. Blushing, even though it's involuntary, is more ore less a learned behavior.
W: What do you mean？
M: Oh, children hardly ever blush at all. And, among adults, supposedly women blush more than men.
W: I wonder why.
M: I don't know. But I had a friend in high school, Brian Smith. It was really easy to make him blush. He turned red whenever a waitress would ask him for his order.
W: I'm not that bad. Well, I've got to get going for my next class. I'll talk to you later.
(23)

A. She had not completed her assignment.
B. She was unable to attend her psychology class.
C. She felt embarrassed in class.
D. Her presentation received a poor grade.