听力原文：W: Eastern Airlines Agency. Good Morning.
M: Good Morning. I want to book a round-trip ticket.
W: Where are you flying from, and what's your destination, sir？
M: From Montreal to Toronto.
W: What day do you want to fly？
M: I want to leave on Monday the 24th and return on Friday. Do you have any flights in the afternoon？
W: Yes, we do. By the way, will that be first class or economy class？ How many people are there in your party？
M: Just myself. And I'd like economy class.
W: All right, there are seats still available. Would you prefer a window, aisle or center seat？
M: Window, please. Thank you.
What does the man book？

A round-trip air ticket.
B. A one way ticket.
C. A single room.