Three identical spherical shells, each of mass m and radius r are placed as shown in the figure.

Three identical spherical shells, each of mass m and radius r are placed as shown in the figure. Consider an axis XX ' which is touching the two shells and passing through the diameter of the third shell. The moment of inertia of the system consisting of these three spherical shells about XX ' axis is:
NEET 2015

A) 11/5 𝑚𝑟^2
B) 3𝑚𝑟^2
C) ( 16)/5 𝑚𝑟^2
D) 4𝑚𝑟^2