Mojo mining has a bond outstanding that sells for $2,174 and matures in 18 years. The bond pays semiannual coupons and has a coupon rate of 7.14 percent. the par value is $2,000. If the company's tax rate is 40% what is the aftertax cost of debt?

A. 3.60%

B. 3.79%

C. 6.51%

D. 4.13%

E. 6.32%