A circular disc A of radius r is made from an iron plate of thickness t and another circular disc B of radius 4r is made from an iron plate of thickness `t//4`. The relation between the moments of inertia `I_(A)` and `I_(B)` is (about an axis passing through centre and perpendicular to the disc)
A. `l_(A)gtl_(B)`
B. `l_(A)=l_(B)`
C. `l_(A)ltl_(B)`
D. depends on the actul values of t and r
