Total surface area of a cuboid = 2(lb + bh + lh). Here lb=162, bh=12, and lh=216. So TSA = 2 × (162 + 12 + 216) = 780 square m. A cuboid has three pairs of equal rectangular faces: lb, bh, and lh. We add these three face areas and multiply by 2 to include the opposite faces. The answer is in square units, so the correct choice is 780 m².