Which of the following bonds has the smallest price risk?

a. A 3-year 5% annual coupon bond with a $1,000 maturity value.

b. A 10-year 7% annual coupon bond with a $1,000 maturity value.

c. A 3-year 10% annual coupon bond with a $1,000 maturity value.

d. A 5-year zero coupon bond with a $1,000 maturity value.

e. A 5-year 5% annual coupon bond with a $1,000 maturity value.