The correct answer is 54 CUBIC.
The following information are given in the question:
Height, H = 9 feet
Diameter, B = 6 feetV
Volume of cylinder = ?
The formula for finding the volume of a cylinder is:
V = BH, Where, V is the volume, B is the diameter and H is the height.
V = 6 * 9 = 54.
Therefore V = 54 Cubic feet.