Walmarts bonds currently sell for $1,811. They pay a $87 semi-annual coupon, have a 7-year maturity, and a face value of $1,000, but they can be called in 4 years at $2,222. Their yield to call is closest to

A.

9.59%.

B.

8.42%.

C.

4.80%.

D.

4.21%.