The following is the formula for volume:

The easiest way to solve this problem would be to plug in each answer. Let's try them all.
A.) 

B.) 

C.) 

We can eliminate B since it does not equal 210 cubic centimeters 
 . By the way, the reason we get cubic centimeters
. By the way, the reason we get cubic centimeters 
 , is because we multiply cm*cm*cm.
, is because we multiply cm*cm*cm.
Your answers would be A and C, since they both equal 
 .
.