Volume of a cylinder = πr²h. Substitute r=15 and h=63: volume = 3.14 × 15 × 15 × 63 = 44509.5 cubic m. Think of a cylinder as many equal circular layers stacked up. So we find the circular base area πr² and multiply by the height. The answer is in cubic units, so the correct choice is 44509.5 m³.