听力原文：W: Friendship Department Store. May I help you？
M: Yes, could you tell me when the store closes today？
W: We close at 7:30.
M: I see. And when do you open？
W: Nine o'clock on the weekend.
M: Fine. Thank you very much.
what's the probable relationship between the two speakers？

A. Receptionist and customer.
B. Waitress and customer.
C. Salesperson and customer.
D. Nurse and patient.