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(D) The system consists of three rings. Let the top ring be $1$,and the two bottom rings be $2$ and $3$. The axis $YY'$ passes through the center of r

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$\frac{7}{2}MR^{2}$

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(D) The system consists of three rings. Let the top ring be $1$,and the two bottom rings be $2$ and $3$. The axis $YY'$ passes through the center of ring $1$ (diameter) and is tangent to rings $2$ and $3$ (parallel to their diameters).$1$. For ring $1$,the axis $YY'$ is its diameter. The moment of inertia is $I_1 = \frac{1}{2}MR^2$.$2$. For rings $2$ and $3$,the axis $YY'$ is parallel to their diameters at a distance $R$. Using the parallel axis theorem,$I = I_{cm} + Md^2$,where $I_{cm} = \frac{1}{2}MR^2$ and $d = R$. Thus,$I_2 = I_3 = \frac{1}{2}MR^2 + MR^2 = \frac{3}{2}MR^2$.$3$. The total moment of inertia of the system is $I = I_1 + I_2 + I_3 = \frac{1}{2}MR^2 + \frac{3}{2}MR^2 + \frac{3}{2}MR^2 = \frac{7}{2}MR^2$.

Column-$I$	Column-$II$
$(A)$ Blue-green algae	$(i)$ Spirogyra
$(B)$ Unicellular algae	$(ii)$ Nostoc
$(C)$ Filamentous algae	$(iii)$ Volvox
$(D)$ Colonial algae	$(iv)$ Chlamydomonas

Three rings each of mass $M$ and radius $R$ are arranged as shown in the figure. The moment of inertia of the system about the axis $YY'$ is:

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