Solve the Problem $x$ Represent the Length of a Side of Each Such Square

Multiple Choice

Solve the problem.
-A rectangular piece of cardboard measuring 24 inches by 30 inches is to be made into a box with an open top by cutting equal size squares from each corner and folding up the sides. Let $x$ represent the length of a side of each such square. What is the maximum volume of this box? If necessary, round to 2 decimal places.

A) $121.87$
B) $585.52$
C) $1417.87$
D) $20,046.4$