Moment of inertia of a hollow cylinder of mass M and radius r about its own axis is

• A. \[\frac{2}{3}M{{r}^{2}}\]
• B. \[\frac{2}{5}M{{r}^{2}}\]
• C. \[\frac{1}{3}M{{r}^{2}}\]
• D. \[M{{r}^{2}}\]