Answer:
a) the bond’s nominal yield to maturity is 5.92% effective annual
b) the bond’s nominal yield to call is 5.33% effective annual
c)Mr. Clark is more likely to receive the bond´s yield to maturity because it is higher than the yield to call.
Explanation:
Hi, in order to find the YTM (yield to maturity) we need to solve the following equation for YTM.

That is:

Since it would take forever to solve this, we need to use the MS Excel function "IRR". The result to this is 2.92% effective semi-annual, but all rates should be presented in effective annual terms, therefore.

Therefore.

So the YTM is 5.92% annual
Now, the bond is callable in 5 years, that means that instead of receiving all the coupons from semester 10 to 18, Mr. Clark will receive $1,040 in semester 10, therefore our equation would be:

Because he receives 10 copupons and 1,040 in year 5. Therefore, using the IRR excel function we get a YTC = 2.63%
Which in effective annual terms is

So the effective annual rate of the YTC is 5.33%
For all of the above, Mr. Clark would like to receive the YTM because it is a higher rate.
Best of luck.