Quigley Inc.'s bonds currently sell for $1,080 and have a par value of $1,000. They pay a $100 annual coupon and have a 15-year maturity, but they can be called in 5 years at $1,125. What is their yield to maturity (YTM)?

a.

8.56%

b.

9.01%

c.

9.46%

d.

9.93%

e.

10.43%