Which of the following bonds has the greatest interest rate risk?
A A 5-year callable bond with a coupon rate of 6% and a yield to maturity of 8%.
B A 5-year option-free bond with a coupon rate of 6% and a yield to maturity of 8%.
C A 10-year callable bond with a coupon rate of 3% and a yield to maturity of 6%.
D A 10-year option-free bond with a coupon rate of 3% and a yield to maturity of 6%.