A corporate bonds has a face value of $1,000 and a coupon rate of 5%. The bond matures in 15 years and has a current market price of $925. If the corporation sells more bonds it will incur flotation costs of $25 per bond. If the corporate tax rate is 35%, what is the after-tax cost of debt capital?

A. 3.74

B. 4.45

C. 5.29

D. 6.78