A、Put the homework on Don’s desk. B、Leave the master key for Don. C、Give Don’s students the next assignment. D、Call Don at the e

M: Math Department, Dr. Webster speaking.
W: Hello, Professor Webster. This is Janet Hill calling. I live two doors down from your teaching assistant, Don Williams. Don asked me to call you because he’s lost his voice and can’t talk to you himself.
M: Lost his voice? That’s too bad. Is there anything I can do for him?
W: Well, he has a class this afternoon from two-thirty to four, and he won’t be able to make it. But he doesn’t want to cancel it either.
M: Does he want me to try to find somebody else to teach it?
W: No, not exactly. What he wants to do is get someone to go in for him--just to pass back the midterm exams. He’s already marked them, and they’re on the desk in his office. The whole thing wouldn’t take more than.., oh, ten minutes or so.
M: Two-thirty, you say? Well, I’m free then, and I was going to be on campus anyway, so I could do it for him. Where’s his class?
W: Carter Hall, room two-fourteen. Will you need his office key to get the exams? I could bring it to you.
M: Well, actually, that won’t be necessary. We have a master key in the Math Department. so I can get into his office.
W: Thank you, Professor Webster.
M: My pleasure.
W: Don doesn’t have another class to teach until Thursday, and hopefully he’ll be able to talk by then. He’ll call you as soon as he can. Oh, and.., uh... I almost forgot...
M: Yes?
W: Could you put the next assignment on the board too? They should solve the equations at the end of chapter eight, and that’s due at the next class.
M: Okay. No trouble at all. Thanks. for the news about Don, and tell him not to worry about this.