Answer: Option B.
Step-by-step explanation:
Given the polynomial:

Observe that
and
are perfect squares. Then, you can rewrite the polynomial in this form:

You can identify that:

Then, we can check if 

Since
, the polynomial
<em>IS NOT </em>a perfect square trinomial of the form 
height of pyramid = 3*(V/A)
V=48in^3
A=24in^2
So 3*(48/24) = 3*2=6
Your answer is C. 6.5!
If you need steps just tell me!
Hope this helped!
:)