A heap of sand is in the shape of a right circular cone. It has a slam height of 10 feet and a base diameter of 16 feet. Find the volume of sand making up the heap. Take $$\pi = 3.14$$.

A

401.92 $$ft^{3}$$

B

423.89 $$ft^{3}$$

C

301.96 $$ft^{3}$$

D

441.72 $$ft^{3}$$