单项选择题

W: What size do you wear M: Forty. W: Oh, you’re lucky. I have the best shoes in the store in forty. Here they are. Why don’t you try them on. M: OK, I’ll have a try.

What is the most probable relationship of the two people()

A.Teacher and student.
B.Boss and employee.
C.Salesperson and customer.
D.Doctor and patient.