An analyst does research about a callable bond. All else being equal, is a callable bond most likely to exhibit negative convexity when the prevailing market yield for that bond is relatively:（）

单项选择题A bond is selling at a premium relative to its par value. Which of the following relationships holds（）

A. Yield to maturity＞coupon rate＞current yield.
B. Current yield＞yield to maturity＞coupon yield.
C. Coupon rate＞current yield＞yield to maturity.

单项选择题An analyst does research about calculating relative yield spread and gathered the following yield information about two bonds: Issue Yield 5 year on-the-run Treasury 5.10% 5 year A-rated security 6.35% The relative yield spread between these two bonds is closest to:（）

A. 4.5%
B. 19.7%
C. 24.5%