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Two discs A and B have same mass and sam...

Two discs A and B have same mass and same thickness. If `d_1` and `d_2` are the densities of the materials of the discs A and B respectively, then the ratio of the moment of inertia of the discs A and B about their geometrical axis is

A

`frac{d_1^2}{d_2^2}`

B

`frac{d_2^2}{d_1^2}`

C

`frac{d_1}{d_2}`

D

`frac{d_2}{d_1}`

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