The radius of the bottom surface of the cylinder is r and the height is 2R.

∴V cylinder =πR2×2R=2πR3, V sphere = 43π R3.

∴V cylinder V ball =2πR343πR3=32,

S cylinder =2πR×2R+2×πR2=6πR2, and S sphere = 4 π r2.

∴S cylinder s sphere = 6 π r24 π r2 = 32.

So choose C.