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.

With respect to floating-rate bonds, a reference rate (such as MRR) is most likely used to determine the bond’s:
Option A:spread.
Option B:coupon rate.
Option C:frequency of coupon payments.

Answer: B