Answer:
C) 12, 20, 24
Explanation:
A similar triangle with a scale factor of 4 means the other measurements can be divisible by 4 to get the original measurements of 3, 5, 6.
This also means that you can multiply each of the original values (3, 5, 6) by 4 to get you the other dimensions.
3 * 4 = 12
5 * 4 = 20
6 * 4 = 24