听力原文：M: How much do you charge for a piano lesson here？ I was recommended by a friend

of mine who took lessons here a couple of years back.

W: Well, we charge by the hour here, and it's 20 dollars an hour.

M: Wow, that's a bit too pricey. Is there any type of discount considering the fact that I am going to sign up for a year or so.

W: Well, we do at times consider giving a discount, but you'd have to pay the entire fee in advance. Why don't you sit down, and I'll tell you more about it.

How did the man learn of this place？

A．He saw an ad in the paper.

B．He was referred by someone.

C．He happened to see it while walking.

D．He knows the owner of the store.