Answer: False, there are 12 possible combinations.
Explanation:
Each pair of pants matches to each shirt.
She has 3 pairs of pants (1, 2, & 3) and 4 shirts (A, B, C, & D).
Here are all of the combinations:
1A 1B 1C 1D
2A 2B 2C 2D
3A 3B 3C 3D
There are 3 pants × 4 shirts = 12 different combinations