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Which one of the following statements concerning debt instruments is correct? a. The coupon rate and yield of an outstanding long-term bond will change over time as economic factors change. b. A 25-year bond with a coupon rate of 9% and one year to maturity has more interest rate risk than a 10 -year bond with a 9% coupon issued by the same firm with one year to maturity. c. For long-term bonds, price sensitivity to a given change in interest rates is greater the longer the maturity of the bond. d. A bond with one year to maturity would have more interest rate risk than a bond with 15 years to maturity