Volume of a cylinder = πr²h. Substitute r=11 and h=69: volume = 3.14 × 11 × 11 × 69 = 26215.86 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 26215.86 m³.