JEE Main 2021 Physics question

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Moment of inertia of a circular disc of mass 'M' and radius 'R' about X, Y axes (passing through its plane) and Z-axis which is perpendicular to its plane were found to be , and respectively. The respective radii of gyration about all the three axes will be the same. Reason R : A rigid body making rotational motion has fixed mass and shape. In the light of the above statements, choose the most appropriate answer from the options below :

• (A)Both A and R are correct but R is NOT the correct explanation of A.
• (B)A is not correct but R is correct.Correct
• (C)A is correct but R is not correct.
• (D)Both A and R are correct and R is the correct explanation of A.