请教一个yield to maturity的题目 discount, payments, received, present, about

garmma

The yield to maturity is:
   
A) below the coupon rate when the bond sells at a discount, and about the coupon rate when the bond sells at a premium.

   
B) the discount rate that will set the present value of the payments equal to the bond price.

   
C) based on the assumption that any payments received are reinvested at the coupon rate.

   
D) none of these answers are correct.

A为什么不对呢