A Simple Pendulum Consists of a Ball of Mass M $\theta$

Multiple Choice

A simple pendulum consists of a ball of mass m suspended from the ceiling using a string of length L. The ball is displaced from its equilibrium position by a small angle $\theta$ . What is the magnitude of the restoring force that moves the ball toward its equilibrium position and produces simple harmonic motion?

A) kx
B) mg
C) mg(cos $\theta$ )
D) mg(sin $\theta$ )
E) mgL(sin $\theta$ )