Four identical squares are cut from the corners of the rectangular sheet of cardboard shown. This sheet is then folded along the dotted lines and taped to make a box with an open top. The base of the box measures 5\:cm by 4\:cm. The volume of the box is 60\:cm^3. What was the area of the original sheet of cardboard?
Answer Choices
A. 56\:cm^2
B. 110\:cm^2
C. 156\:cm^2
D. 180\:cm^2
E. 210\:cm^2