To check whether the program is working properly for the "2 and below" category, appropriate test data would need to include ages that fall within that category (2 and below) and some that fall outside of it to ensure the program properly distinguishes between them.
From the given options:
- 0, 1, 2, 3: This set includes ages 0, 1, and 2 (which are all free) as well as 3 (which should not be free and should cost $5.00).
Thus, the most appropriate choice for testing the "2 and below" category is: 0, 1, 2, 3.