单项选择题

Woman: What can I do for youMan: I would like to get my money work for me.Woman: There are two kinds. One is relatively safe but offers a low return on your money, the other promises high profits but that involves considerable speculation. Which one do you preferQuestion: What is the probable relationship between the two speakers

A.An investment consultant and her client.
B.A bank teller and her customer.
C.An insurance agent and her client.
D.A stock-holder and his trustee.