PLEASE HELP I WILL MARK BRAINLIST!! The diagram shows a swinging pendulum. Which best explains what happens to the motion of the pendulum due to the law of conservation of energy?

The pendulum will slow down and eventually stop moving as the mechanical energy transforms to thermal energy.

The pendulum will slow down and eventually stop moving as the mechanical energy disappears.

The pendulum will continue moving at the same speed because mechanical energy is created as the pendulum moves.

The pendulum will slow down but will not stop moving because some of the mechanical energy is destroyed.