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 variability of the coupon rate on a Libor-based floating-rate bond is most likely due to:
Option A:periodic resets of the reference rate.
Option B:market-based reassessments of the issuer’s creditworthiness.
Option C:changing estimates by the Libor administrator of borrowing capacity.

Answer: A