A、The man needs to wait for half an hour. B、The departure time for the bus has been changed. C、The man will go to the airport by

W: I am a bit fed up with catching the same train every morning, sitting in the same office all day, and watching the same television programs.
M: Well, our great-great-grandfathers had more fun, didn’t they? They hunted for their food and grew their own vegetables and did things for themselves.
Q: What does the man mean?

M: Why hasn’t the bus come yet? We have been waiting here for a while. What time does the bus leave for the airport?
W: I don’t know. It used to leave every half an hour, but I think the schedule’s been changed.
Q: What do we learn from the conversation?