Because of a Change in the Required Rate of Return

Because of a change in the required rate of return from 11 percent to 13 percent, the bond price of a zero-coupon bond will fall from $1,000 to $860. Thus, the bond price elasticity for this bond is

A) 0.77.
B) -0.77.
C) -0.90.
D) -1.06.
E) none of the above.