The lateral area of a three-dimensional solid is the area of all the lateral face. It is calculated as follows:
LA = hP
LA = h(2(w) + 2(l))
LA = 3(2(12) + 2(7))
LA = 114 m^2
The surface area is calculated as follows:
SA = LA + 2B
SA =LA + 2(w)(l)
SA = 114 + 2(12)(7)
SA = 282 m^2
Therefore, the correct answer is option A.