Which of the following bonds is most sensitive to changes in market interest rates?

Select one:

a. 3% coupon, 9 years to maturity

b. 4% coupon, 10 years to maturity

c. 3% coupon, 12 years to maturity

d. 5% coupon, 5 years to maturity

e. 6% coupon, 8 years to maturity