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.

Which of the following sources of return is most likely exposed to interest rate risk for an investor of a fixed-rate bond who holds the bond until maturity?
Option A:Capital gain or loss
Option B:Redemption of principal
Option C:Reinvestment of coupon payments

Answer: C