Answer:
a. Ava must include in her gross income $10 for every meal that is provided by her employer. The meals provided by Ava's employer are a convenience for her and the rest of the employees, the employer doesn't benefit form them. They should be considered a fringe benefit, and therefore, they are taxable.
b. Scott doesn't need to include any of the lodging expenses in his gross income. In this case, the lodging is provided to Scott but the employer benefits from it (convenience for the employer, not the employee).
c. Ira doesn't need to include the use of the apartment in his gross income. Even though Ira benefits from using the apartment, it represents no additional cost to the employer since the apartment would be empty if Ira didn't use it (no benefit lost or extra cost).