A Rectangular Package to Be Sent by a Delivery Service

Multiple Choice

A rectangular package to be sent by a delivery service can have a maximum combined length and girth (perimeter of a cross section) of 168 inches. ​ ​
Write a function that represents the volume of the package.
​

A) V(x) = - 4x²(42 + x)
B) V(x) = 4x²(42 + x)
C) V(x) = 4x²(42 - x)
D) V(x) = 4x²(-42 - x)
E) V(x) = - 4x²(42 - x)