When the pendulum shown below swings from point A to point B, what happens to its total mechanical energy (ignoring friction)?

The image depicts a simple pendulum with two bobs, one at rest and the other swinging. The image is a line drawing and depicts a simple physics concept of a pendulum, with two circular bobs, one labelled A and the other B, connected to a horizontal line by a string. Bob B is swinging in a clockwise direction and Bob A is at rest. The image is simple and straightforward, devoid of any emotion or mood.

(1 point)
Responses

Total mechanical energy stays the same.
Total mechanical energy stays the same.

Total mechanical energy goes up.
Total mechanical energy goes up.

Total mechanical energy goes down.
Total mechanical energy goes down.

Total mechanical energy is not conserved.