A、By plane. B、By car. C、By train. D、By bus. D听者应该关注女士“but”后面的话。该女士认为坐汽车比自己开车或坐飞机更划算，故选D。

W: Will you please return these books to Bob when you see him?
M: Of course, I’ll see him in class this afternoon.
Q: What did the man say he would do?

M: You’re going to Chicago tomorrow, aren’t you?
W:Yes. I thought I’d fly, but then I decided that taking a bus would be cheaper than driving or flying.
Q: How will the woman get to Chicago?