Answer:
d.The unamortized discount decreases from its balance at issuance date to a zero balance at maturity
Step-by-step explanation:
The amount of annual interest is the carrying amount at the beginning of each year multiplied by the market rate of interest of 10%(not the discount rate of 8%)
Also, a bond whose market interest rate is higher than the coupon rate would be issued at a discount(not at a premium, let alone having an unamortized premium)