Final answer:
The volume of the cylindrical water storage tank is calculated using the formula V = πr²h, resulting in a volume of 40π cubic meters, corresponding to option (b).
Step-by-step explanation:
The subject of the question is the calculation of the volume of a cylindrical water storage tank. To find the volume of a cylinder, we use the formula V = πr²h, where V is the volume, r is the radius, and h is the height of the cylinder. For the given cylinder with a radius of 2 meters and a height of 5 meters, the calculation would be:
V = π(2 meters)²(5 meters)
V = π(4 meters²)(5 meters) = 20π meters³
Hence, the correct option for the volume of the tank is (b) 40π cubic meters.