You purchased a 9 year annual coupon bond 1 year ago. its coupon rate is 10% and its par value is $1,000. At the time you purchased the bond, the yield to maturity was 10% You sold the bond and its maturity had changed to 9%. Your holding period return is

a. 15.53%

b. 10%

c. 5.5%

d. 9%