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.

If no cash is initially exchanged, a swap is comparable to a series of forward contracts when:
Option A:the swap payments are variable.
Option B:the combined value of all the forward contracts is zero.
Option C:all the forward contracts have the same agreed-on price.

Answer: B