听力原文：M: Good morning. May I help you？W: Yes, I want to find out about the bus service

听力原文：M: Good morning. May I help you？

W: Yes, I want to find out about the bus service between here and my home in Detroit. I came here last week by train, but I think I want to return by bus. I like to try different ways of traveling.

M: I'll try to help you. Here is our schedule. It shows that we have eight buses a day that leave Cleveland for Detroit. I think you'll find that the service is cheaper than the train's.

W: Yes, it looks as though the tickets are quite a bit cheaper than the train tickets. Why is that？

M: The bus trip takes a little longer than the train trip, and we don't have a dining car or a lounge. We do have a rest room, however, and the bus is air-conditioned. The trip should be comfortable.

W: How long is the trip？

M: We have an express bus that takes a little more than three hours, and we have a bus that stops at several cities along the way. It's cheaper, but it takes a little more than four hours. If you don't mind the extra traveling time, it's our best bargain. W: Can I use my return ticket from the train to pay for my bus ticket？

M: No, you'll have to take that ticket back to the train station. That's different company. They'll give you your money back, and then you can buy a ticket from me here for the bus.

W: Thank you, I want to talk this over with my aunt and uncle before I decide. I appreciate your help.

M: You're welcome.

Where does this conversation take place？

A．In Detroit.

B．At the railroad station.

C．At the bus station.

D．At Cleveland airport.