You are the first to arrive at the scene of a motorcycle accident where the rider is unconscious on the road. After ensuring the scene is safe, what is the most critical immediate action you should take?

1. Move the motorcycle off the road to prevent traffic obstruction.
2. Check the rider for breathing and call for an ambulance.
3. Immediately remove the rider's helmet to check for head injuries.
4. Attempt to give the unconscious rider some water.