If the scene is not safe for you, it is dangerous for others too. By approaching, you may get hurt yourself, so you do not approach, you immediately report what has happened and you do not let others approach.
In any emergency, the rescuer's own safety is the absolute priority. If safety at the scene cannot be ensured (for example, because of a fire, toxic gases or a risk of collapse), you must not approach the victims, as you may get hurt yourself. Instead, immediately call the emergency services and do not let unauthorized persons enter the danger zone.
Option 1. Entering an unsafe place puts your life at risk, however careful you try to be.
Option 2. Even approaching the nearest victim in the danger zone can get you hurt yourself.
Option 4. If the scene is not safe for you, it is not safe for others either, so you must never ask someone else to risk their life.