A company that manufactures storage bins for grains made a drawing of a silo. The silo has a conical base, as shown below:

Which of the following could be used to calculate the total volume of grains that can be stored in the silo? (6 points)

Group of answer choices:

A) π(8.5ft)^2(2ft) + 1/3π(2ft)^2(13ft − 8.5ft)
B) π(2ft)^2(8.5ft) + 1/3π(2ft)^2(13ft − 8.5ft)
C) π(8.5ft)^2(2ft) + 1/3π(13ft − 8.5ft)^2(2ft)
D) π(2ft)^2(8.5ft) + 1/3π(13ft − 8.5ft)^2(2ft)