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%