问题如下：
An investor buys a plain vanilla bond at a discount and decides to hold it to maturity. Assuming all payments made as scheduled, which of the following source of return is least likely contribute to the bondholder's total return over the investment horizon?
选项：
A.Capital gain
B.Principal payment
C.Reinvestment of coupon payments
解释：
A is correct.
No capital gain when bond is held to maturity.
请问，老师，如果买了之后未持有至到期，什么情况下有capital gain or loss
