The rule of the volume of the cone is
r is the radius of the base
h is the height
Since the given volume is 235.5 cube yards
Then V = 235.5
Since the radius of the base is 5 yards
Then r = 5
Use pi = 3.14
Substitute them in the rule above
Divide both sides by 157/6
The height of the cone is 9 yards
The answer is C