Which of the following bonds has the greatest price sensitivity to changes in interest rates? Calculation is NOT required. O a. 3 years to maturity, 4 percent coupon O b. 3 years to maturity, 6 percent coupon O c. 7 year to maturity, 4 percent coupon O d. 7 years to maturity, 6 percent coupon O e. 7 years to maturity, 7 percent coupon