A disc of mass \( M \) and radius \( R \) is rolling with angular s...

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
\( P \)
\( (1999,2 \mathrm{M}) \)
(a) \( \left(\frac{1}{2}\right) M R^{2} \omega \)
(b) \( M R^{2} \omega \)
(c) \( \left(\frac{3}{2}\right) M R^{2} \omega \)
(d) \( 2 M R^{2} \omega \)