A、She has to change the time for the trip. B、She can’t afford the time for the trip. C、She hasn’t decided where to go next month

M: I need to use more than just my math skills for these questions but I don’t have a calculator. Shall I go and buy one?
W: Actually, I’ve got two. And I’ll let you have one for the cost of a coffee.
Q: What does the woman mean?

M: You’re going to make a trip to San Francisco, aren’t you?
W: Yes. But I haven’t got the plane ticket yet. I’m thinking of postponing the trip to next month since this is the busiest month for the airlines.
Q: What do we know about the woman from this conversation?