Say One Morning You Are Considering Whether to Take a Taxi

Say one morning you are considering whether to take a taxi cab or riding the train to work. Both mediums would cost you about $4, but you have already paid in advance for the train (since you pay a flat fee at the beginning of the month) . If the cab ride would take slightly less time than the train ride, and you are mostly concerned with the time it takes you to get to work, you should:

A) take the train since you already paid for it.
B) take the cab.
C) be indifferent between either modes of transportation.
D) find another way to get to work.