A right rectangular prism has a volume of 48 ft3. Which of the following could not be the dimensions of the prism?

l = 2 ft, w = 2 ft, h = 12 ft

l = 2 ft, w = 4 ft, h = 6 ft

l = 3 ft, w = 2 ft, h = 8 ft

l = 4 ft, w = 3 ft, h = 3 ft

For a rectangular prism, V = lwh.

First choice: 2*2*12 = 48, so this is possible.

Second choice: 2*4*6 = 48, so this is possible.

Third choice: 3*2*8 = 48, so this is also possible.

Fourth choice: 4*3*3 = 36, so these cannot be the dimensions of the prism.

The fourth choice is the correct answer.