W: Are you all right, Mark? Is anything wrong? M: I'm so homesick, I could die. All this studying, all this pressure, I just can't stand it. W: It takes time to get used to all this. M: Yes. But, you know, I lost sleep last night. W: It seems like you've really got the blues. Have you heard from home recently? M: It's been almost a month since I got a letter from my mum. I'm going to write to her and explain the situation. By the way, do you have an envelope that I can borrow? W: Sorry, I don't have any. I hardly ever send any letters. M: The bookstore is closed today. Is there another place I can get some stamps? W: You can go to the post office on North Street to buy stamps., Question: Who is the man? (A) A student. (B) A teacher. (C) A postman.
(A) A student.