Answer:
C
Explanation:
They all share sides.
Let's first look at 24 and 18.
The common factors are 1,2,3,6
Let's also look at 12 and 18.
It's also 1,2,3,6
What is shared with 24 and 18 that when it is multiplied by the other factor it will be equal to 18 and then that multiplied will be equal to 10?
24 dimensions : 6 x 4
18 dimensions : 6 x 3
12 dimensions : 4 x 3
So the dimensions are 3 x 4 x 6 or answer choice C.