Which of the following Treasury bonds will have the largest amount of interest rate risk (price risk)?

A. a. A 7 percent coupon bond which matures in 12 years.

B. b. A 9 percent coupon bond which matures in 10 years.

C. c. A 12 percent coupon bond which matures in 7 years.

D. d. A 7 percent coupon bond which matures in 9 years.

E. e. A 10 percent coupon bond which matures in 10 years.