A、Professor and student. B、Mother and son. C、Husband and wife. D、Classmates. A对话中，女士说她发现男土上个星期提交的论文与William的论文完全一样，因此她要求男士就此事进行解

W: This apartment consists of two bedrooms, a living room with a satellite TV, a completely equipped kitchen and a great bathroom. And the charge is quite reasonable, you know.
M: Yes, that’s right. But if it’s located on the other side of town, we’ll definitely buy it.
Q: What does the man think of the apartment?

W: Well, you handed in your paper last week, but I found that it was exactly the same as William’s. Can you explain this to me, please?
M: I’m sorry. I won’t do it again.
Q: What’s the probable relationship between the two speakers?