Answer:
A. The market yield rate fluctuated between the time the bond agreement was written and the date the bonds were actually issued to investors
Step-by-step explanation:
Interest rate changes and changes in the market price of outstanding bonds have an inverse relationship. If the market rate of interest is more than coupon rate than the bonds are sold at discount to match the market interest rate and if the coupon rate is more than market rate than bonds are sold at premium for match the market rate of interest.
Coupon rates one decided than there is no change in the life time of the bonds but market rate are always changing and because of this the bonds are sell at discount or premium.