If a Box with a Square Cross Section Is to Be

Multiple Choice

If a box with a square cross section is to be sent by a delivery service, there are restrictions on its size such that its volume is given by the function , where x is the length of each side of the cross section (in inches) . What restrictions must be placed on x (the domain) so that the volume makes physical sense? ​

A) 0 < x < 66
B) -66 < x < 0
C) 0 < x < 22
D) 0 < x < 3
E) -3 < x < 3