A、Once a week. B、Three every month. C、Five every month. D、Two every month C信息明示题，女士明确表明学校每月组织五次旅行，故选C

M: Good morning.
W: Good morning. How can I help you?
M: I understand that the school organizes...umm, trips to different...
W: Yes, we run five every month: three during weekends and two Wednesday afternoon trips.
M: What sort of places?
W: Well, obviously it varies, but always places of historical interest and also which offer a variety of shopping, because our students always ask about that...and then we go for ones where we know there are guided tours, because this gives a good focus for the visit.
M: Do you travel far?
W: Well, we’re lucky here, obviously, because we’re able to say that all our visits are less than three hours’ drive.
M: How much do they cost?
W: Again it varies--between five and fifteen pounds a head, depending on distance.
M: Ah ha...
W: Oh, and we do offer to arrange special trips if, you know, there are more than twelve people.
M: All right. I’ll keep that in mind. And what are the times normally?
W: We try to keep it pretty fixed so that students get to know the pattern. We leave at eight-thirty a.m. and return at six p.m. We figure it’s best to keep the day fairly short.
M: Oh yes. And how do we reserve a place?
W: You sign your name on the notice board. Do you know where it is?
M: Ah ha. I saw it this morning.
W: And we do ask that you sign up three days in advance so we know we’ve got enough people interested to run it, and we can cancel if necessary; with full refund of course.
M: That’s fine. Thanks.