​VolumeA Rectangular Box with a Square Base Is to Be

Multiple Choice

​Volume.A rectangular box with a square base is to be formed from a square piece of metal with 54-inch sides.If a square piece with side x is cut from each corner of the metal and the sides are folded up to form an open box,the volume of the box is What value of x will maximize the volume of the box? ​ ​

A) ​27
B) ​2
C) ​9
D) ​14
E) ​1