Can someone with a few questions? for some of them i just need my answer checked.

1.the trunk of a pine tree will be cut up to make boards.
´the trunk is 52 feet long.
´the base of the trunk is a circle 1.5 feet across.
´the trunk tapers gradually to a point at the top.
which expression best models the volume of the trunk?
a. pi*.75^2*52
b. pi*1.5^2*52
c.1/3*pi*.75^2*52
d.1/3*pi*1.5^2*52