b. All else remaining the​ same, when the required return differs from the coupon interest rate and is assumed to be constant to​ maturity, what happens to the bond value as time moves toward​ maturity? ​(Select the best answer​ below.) A. The bond value approaches the amount of the last interest payment. B. The bond value approaches zero. C. The bond value approaches infinity. D. The bond value approaches the par value.