Keys Printing 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 40.00%, but Congress is considering a change in the corporate tax rate to 45.00%. By how much would the component cost of debt used to calculate the WACC change if the new tax rate was adopted?

a. 0.36%

b. 0.42%

c. 0.44%

d. 0.35%

e. 0.30%