单选题 An analyst does research about valuation of bond. An option-free 6 percent coupon bond has an annual discount rate of 5 percent, pays interest semiannually, matures in five years, and is valued at $1043.76. One year later, the annual discount rate for that bond is 4.5 percent and the bond is valued at $1054.35. The change in value for this bond that is attributable only to the change of discount rate is closest to:
A. -$7.91
B. $7.91
C. $18.5