Word problem below giving me trouble.?

Question

At what rate, in stere per minute, is the volume of a sphere increasing if the radius of the sphere is two meters in length and is increasing at a rate of three meters per minute.

possible solutions...

32pi

48pi

72pi

108pi

or could it be none of these?

Answer 1

V= 4/3 pi r^3
dV = 4 pi r^2 dr
dV = 4*pi * 2^2 * 3
dV= 48pi steres/min