Curved surface area of a cylinder = 2πrh. So CSA = 2 × 3.14 × 8 × 70 = 3516.8 square cm. This excludes the two circular ends. 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 3516.8 cm².