Speaker A: I wonder if we can book our room for another three nights. Speaker B: ______A．W

Speaker A: I wonder if we can book our room for another three nights. Speaker B: ______

A．What is the room number？

B．Why have you decided to stay longer？

C．Have you made a reservation at our hotel？

D．What kind of room do you want, single or double？

请帮忙给出正确答案和分析，谢谢！