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 rate, interpreted to be the incremental return for extending the time-to-maturity of an investment for an additional time period, is the:
Option A:add-on rate.
Option B:forward rate.
Option C:yield-to-maturity.

Answer: B