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.

A “buy-and-hold” investor purchases a fixed-rate bond at a discount and holds the security until it matures. Which of the following sources of return is least likely to contribute to the investor’s total return over the investment horizon, assuming all payments are made as scheduled?
Option A:Capital gain
Option B:Principal payment
Option C:Reinvestment of coupon payments

Answer: A