A sphere of radius R and made of materia...

A sphere of radius R and made of material of relative density `sigma` has a concentric cavit of radius r. It just floats when placed in a tank full of water. The value of the ratio `R//r` will be

A

`((rho)/(rho-1))^(1//3)`

B

`((rho-1)/(rho))^(1//3)`

C

`((rho+1)/(rho))^(1//3)`

D

`((rho-1)/(rho+1))^(1//3)`

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