A disc of mass $M$ and radius $R$ is rolling with angular speed $\omega $ on a horizontal plane as shown. The magnitude of angular momentum of the disc about the origin $O$ is
A disc of mass $M$ and radius $R$ is rolling with angular speed $\omega $ on a horizontal plane as shown. The magnitude of angular momentum of the disc about the origin $O$ is
- A
$\frac {1}{2} MR^2\omega $
- B
$MR^2\omega $
- C
$\frac {3}{2} MR^2\omega $
- D
$2MR^2\omega $
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