Answer: The correct option is
(C)

Step-by-step explanation: We are given to find the volume of the cone in the figure.
We know that the VOLUME of a cone with radius r units and height h units is given by

From the figure, we note that
radius, r = 10 units and height, h = 81 units.
Therefore, the VOLUME of the cone will be

Thus, the volume of the cone is

Option (C) is CORRECT.