The given figure shows a simple pendulum executing simple harmonic motion (SHM). The restoring force in the given simple pendulum is equal to

Explanation

In a simple pendulum executing simple harmonic motion, the restoring force is given by the formula F = -mgθ, where θ is the angular displacement. The negative sign indicates that the force is directed opposite to the displacement, acting to restore the pendulum to its equilibrium position. Option A is correct because it accurately reflects this relationship.Option B is incorrect because it suggests a constant force that does not depend on displacement, which is not characteristic of simple harmonic motion. Option C is incorrect as it lacks the negative sign, which is crucial for indicating the directional nature of the restoring force. Option D is incorrect because it only accounts for the gravitational force without considering displacement.