A cylinder has a radius of 5 feet and a height of 8 feet. Which of the following can be used to calculate the volume of a cone that fits exactly inside the cylinder?
A. (3.14)(5^2)(8)
B. 1/3(3.14)(5^2)(8)
C. (3.14)(8^2)(5)
D. 1/3(3.14)(8^2)(5)