单选题 What is the relationship between the speakers?

A、 Mother and son.
B、 Doctor and patient.
C、 Teacher and student.
D、无

【正确答案】 C

【答案解析】原文：M: Would you mind if I borrow your car?W: Well, when exactly?M: Until Monday or Tuesday of next week.W: I’m sorry, but my family is going out this weekend.