A Pendulum Bob of Mass M Is Set into Motion $\theta$

A pendulum bob of mass m is set into motion in a circular path in a horizontal plane as shown in the figure. The square of the angular momentum of the bob about the vertical axis through the point P is:

A) m² gl3 sin4 $\theta$ /cos $\theta$
B) m² gl3 sin3 $\theta$ /cos $\theta$
C) m² gl3 sin2 $\theta$ /cos $\theta$
D) m² gl3 sin $\theta$ /cos $\theta$
E) m² gl3 sin2 $\theta$