The volume of sphere is 4/3[tex]\pi r^3[/tex]
The volume of the cylinder is [tex]\pi r^2 h[/tex]
As the height of cylinder is equal to its radius , its volume = [tex]\pi r^3[/tex]
Now from the formula , you can simply see that volume of sphere is 4/3 of the volume of the cylinder
Thus the answer is (c) 4/3 of 11