The volume of a sphere is 81π cubic centimeters. Which equation can be used to solve for the radius of the sphere? A. 81π=4πr^2 B. 81π=4πr^3 C. 81π=4/3πr^3 D. 81π=4/3πr^2

we know that

[volume of a sphere]=(4/3)*pi*r³
volume=81*pi cm³
so
81*pi=(4/3)*pi*r³

therefore

the answer is the option
C.)  81π=4/3πr^3