PLEASE HELP!!!!!!!!!!

An open storage box is shaped like a square prism but without a top face. the base of the box is a square with side length 12 in., and the height of the box is 10 in. what is the surface area of the box?

A.) 600 square inches

B.) 624 square inches

C.) 768 square inches

D.) 1,440 square inches


Braden chose C as the answer. Why is his answer incorrect?