Answer: OPTION C.
Step-by-step explanation:
The volume of a cube can be calculated with the following formula:

Where "s" is the length of each edge of the cube.
Solving for "s":
![s=\sqrt[3]{V}](https://tex.z-dn.net/?f=s%3D%5Csqrt%5B3%5D%7BV%7D)
Let's check each option to find which volume would work according to the size she needs:
A. Substitute
into
, then:
![s=\sqrt[3]{216in^3}=6in](https://tex.z-dn.net/?f=s%3D%5Csqrt%5B3%5D%7B216in%5E3%7D%3D6in)
B. Substitute
into
, then:
![s=\sqrt[3]{125in^3}=5in](https://tex.z-dn.net/?f=s%3D%5Csqrt%5B3%5D%7B125in%5E3%7D%3D5in)
C. Substitute
into
, then:
![s=\sqrt[3]{64in^3}=4in](https://tex.z-dn.net/?f=s%3D%5Csqrt%5B3%5D%7B64in%5E3%7D%3D4in)
Based on these results, we can determine that the cubes with a volume of
would work.