A、Bus driver and passenger. B、Taxi driver and passenger. C、Teacher and student. D、Fellow students. D女士说：“今天我们乘公共汽车去大学吧。”男士回答：“不，

M: We have time, don’t we? Every time we’ve gone on a trip, we’ve always been tied down by schedules. This time will be different. We don’t have to rush.
W: You’re right. This is our first trip since you retired We can travel as long as we like.
Q: What does the woman mean?

W: Let’s catch the bus to university today.
M: No way. It’s too slow. I want to catch a cab instead.
Q: What’s the probable relationship between the two speakers?