This is for my Pre calculus_12 class , i need clear explanation and solved solution to show word with a solving method that is full relevant to pre_calculus 12 , Thanks ?

A sheet of paper 12 cm long and 8 cm wide is used to make a box with no lid. Equal squares of side length x cm are cut from each of the corners and the sides are folded up to make the box. Which of the following expresses the volume of the box? A. V(x) = x(12 + x)(8 + x) B. V(x) = x(12 - x)(8-x) C. V(x) = x(12 + 2x)(8 + 2x) D. V(x) = x(12 - 2x)(8 - 2x)