A、To introduce someone to the woman with the same problem. B、To illustrate the benefits of a public-speaking class. C、To give an

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: Terribly. I’m sure I made a fool of myself.
M: Why? Weren’t you prepared?
W: No, it was not that.(12)It’s just that I get so embarrassed and nervous whenever I have to speak in front of a group of people. I stand up and my face gets red and then I get even more nervous because I know everyone can see me blushing.
M: It’s not so bad to blush.
W: But it happens all the time. If the professor asks a question and he calls on me, although I know the answer, I blush like crazy. Doesn’t that ever happen to you?
M: No, not really.(13)Maybe you should just 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’ll help.
M: You know, we talked about it in psychology class.(14)Blushing, even though it’s involuntary, is more or 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,(15)but I had a friend at 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.
12. What is the woman’s problem?
13. What does the man suggest the woman do to avoid being nervous?
14. What does the man say about blushing?
15. Why does the man mention his friend Brian?