【单选题】

Man: I've figured it all out. It looks like it'll take us about 5 hours to drive from here to Chicago. Woman: It'd be more relaxing to take the train. But I guess we should watch our expenses. Question: What does the woman imply
A．She likes to drive when she travels.

B．She doesn't want to go to Chicago.
C．She doesn't know the cost of the train trip.
D．It's cheaper to go to Chicago by car.