【单选题】

Man: Excuse me. Do you need some help Women: Well... I'm trying to get to the railway station, but I can't make heads or tails of this ticket mashine. Question: What is the women's problem
A．She doesn't have the small change with her.

B．She doesn't know how to use the machine.
C．She's not sure how much the trip will cost.
D．She's unable to get the ticket in time.