Suppose that a 10% 15-year bond has the following call structure:

not callable for the next 5 years

first callable in 5 years at $105

first par call date is in 10 years

The price of the bond is $127.5880.

a. Is the yield to maturity for this bond 7.0%, 7.4%, or 7.8%?

b. Is the yield to first call for this bond 4.55%, 4.65%, or 4.85?

c. Is the yield to first par call for this bond 6.25%, 6.55%, or 6.75%?