Answer :
The formula is 3.14 x radius^2 x height, so let's plug in the values. The radius is half the diameter, and the height is 6, so the equation is 3.14 x 5^2 x 6. 5^2 = 25, and 3.14 x 25 = 78.5. 78.5 x 6 = 471, so D is your answer. :)