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There are two thin rings A and B with the same mass and radius, but the mass distribution of ring A is uniform, and the mass distribution of ring B is uneven. Then they
The moments of inertia JA and JB passing through the center of the disk and perpendicular to the disk axis satisfy

(A) JA=JB
(B) JA>JB
(C) JA<JB
(D) not sure which is bigger

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