A、The milk is safe to drink. B、The milk is not safe to drink. C、She couldn’t have bought milk. D、He wouldn’t have milk for break

M: I am really getting worried about Mary. She .will sit in for an exam in two weeks time. But all she is talking about now is nothing but the upcoming concert.
W: She may fail along that line. Let’s try to talk some sense into her.
Q: What are the speakers probably going to do?

W: I bought a pint of milk for our breakfast. But it doesn’t seem to look fresh now. Do you think it’s all right to drink?
M: Let me smell it. Well, it has gone off. If I were you, I wouldn’t even think of it.
Q: What does the man mean?