You cut square corners with side lengths that are whole numbers from a piece of cardboard with dimensions 20 inches by 30 inches. You then fold the cardboard to create a box with no lid. Which of the following dimensions will give you the greatest volume?
A. 12in. By 22in. By 4in.
B. 10in. By 20in. By 5in.
C. 14 in. By 24in. By 2in.
D. 10 in. By 24in. By 6in.