An n-year bond redeemable at par with a face value of $3,000 pays semiannual coupons at a nominal rate of 6% per year. The bond has a nominal yield of 7%, convertible semiannually. The book value after the 7th coupon is $11 more than the book value after the 6th coupon. Find n.

(A) 7.5

(B) 9.0

(C) 11.5

(D) 13.0

(E) 15.0