Westbrook's Painting Co. plans to issue a $1,000 par value, 20-year noncallable bond with a 7.00% annual coupon, paid semiannually. The company's marginal tax rate is 25%, but Congress is considering a change in the corporate tax rate to 15%. By how much would the component cost of debt used to calculate the WACC change if the new tax rate was adopted?

a. 0.77%

b. 0.63%

c. 0.70%

d. 0.85%

e. 0.57%