Answer:
C) less than their face amount.
Step-by-step explanation:
When a bond sells at a lower price than its face value, it is sold at a discount. That means that the price that investors pay for the bond will be lower than its face value because the bond's coupon rate is lower than the market's interest rate.
When a bond is sold at a higher price than its face value, it is sold at a premium, since its coupon rate id higher than the market rate.