Answer:
Option C is correct.
Explanation:
Given: The cylinder has a diameter of 36 feet and a height of h feet. 
To find: volume of the cylinder in cubic feet
Solution:
Diameter of a cylinder = 36 feet
Radius of a cylinder = Radius ÷ 2
 
 feet
 feet
Height of a cylinder = h feet
Volume of a cylinder = 
 
 
Put 
 feet
 feet 
Therefore,
Volume of a cylinder = 
 cubic feet
 cubic feet 
So, option C is correct.