F: What time does the bus leave for the airport? ,M: I don't know. It used to leave every half hour, but I think the timetable has been changed.
(A) F: Yeah, I think so. They should put up some notes for the change of timetable. (B) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) F: Thank you for telling me the way to the airport, that's exactly what I want to know. (D) F: Thank you! Are you sure they didn't change the timetable of the bus to the airport?
A