To test the age category for "2 and below," you want to include values that are at or below this threshold. The appropriate test data for this category would be:
0, 1, 2, 3
This set includes values less than or equal to 2 (0, 1, and 2) and one value above the threshold (3), which can help confirm that the program correctly identifies the cutoff. The other options include ages that are in different categories or do not properly focus on the intended range.