Answer:
b. 1.0%
Step-by-step explanation:
The real rate of return will be difference between the nominal rate and the inflation expected for the period.

The Treasury Note will yield 2.5% but;
There is inflation for 1.5% thus;
Real Rate: 2.50% - 1.50% = 1.00%
The maturity risk is a return added to the rate but, is used in the calculation of the treasury note nominal rate so it is not relevant for this calculation.