Choose the correct letter, A, B or C. What’s the reason of the girl for not hiring a private car?

M: Hello, how are things going?
W: Not bad. But...
M: What’s the trouble?
W: I’m worried about my trip.
M: Yeah. I remember you will go to Cambridge next week. Is that right?
W: Yes. But I’m not sure about the choice of transportation when I get off the flight.
M: Don’t you remember I’m from London?
W: Oh, right. Could you give me some suggestions?
M: Of course.
W: I will arrive at London Heathrow Airport and then go to Cambridge.
M: How about taking a taxi? It is the quickest and most comfortable way.
W: Sure. I know. But it’s too expensive.
M: Right.
W: What do you think of the underground?
M: Darling, there is no underground to your destination from the airport, OK?
W: OK.
M: Why don’t you rent a private car?
W: You mean hire a car at the airport?
M: Yes.
W: Is it very expensive?
M: The cost depends on the type of the car.
W: Maybe it is a good choice. Oh, do I need my driving license?
M: Of course. Don’t you have a license?
W: I lost my driving license the day before yesterday.
M: I’m so sorry.
W: And I do not really want to drive myself after a long flight.
M: Well. How about taking a coach from the airport?
W: A coach?
M: Yes.
W: Do you know how much that costs?
M: Usually, the minimum fare is about thirteen pounds.
W: Single or return?
M: Of course it is a one-way ticket.
W: That’s quite cheap.
M: Yes.
W: How about the number of passengers in a coach?
M: Let me see. It is around 20 to 30.
W: How long would I get to Cambridge by coach?
M: I think it is about three hours.
W: Really? That’s too slow. Why does it need such a long time?
M: Hmmm, because it has so many stops during the route.
W: Oh no.
M: And the last choice is the airport shuttle.
W: Yes. Tell me some more information about it.
M: I’m not very sure about it. It is better for you to get the information from airport clerks.
W: Sure. Do you know the telephone number?
M: Let me check... I think I save it in my mobile phone... yes, here it is.
W: OK. I call it now.