Total surface area of a cuboid = 2(lb + bh + lh). Here lb=244, bh=44, and lh=671. So TSA = 2 × (244 + 44 + 671) = 1918 square mm. 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 1918 mm².