Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The value of a European call option at expiration is the greater of zero or the:
Option A:value of the underlying.
Option B:value of the underlying minus the exercise price.
Option C:exercise price minus the value of the underlying.

Answer: B