Please solve as if there are no multiple choice options. Thanks (:

Solve the problem. 56. A box with an open top is formed by cutting squares out of the corners of a rectangular piece of cardboard and then folding up the sides. If x represents the length of the side of the square cut from each corner, and if the original piece of cardboard is 13 inches by 10 inches, what size square must be cut if the volume of the box is to be 108 cubic inches? X X width X X X length X X A) 6 in. by 6 in. B) 9 in. by 9 in. C) 2 in. by 2 in. D) 3 in, by 3 in