Final answer:
The ambulance should be parked 100 feet away from the site of a cave-in or trench collapse to ensure the safety of both victims and emergency responders.
Step-by-step explanation:
When approaching the site of a cave-in or trench collapse, it is critical for the safety of both the victims and the emergency responders to park the ambulance at a sufficient distance from the site.
The correct distance to park an ambulance from the site of a cave-in or trench collapse is option 4) 100 feet. This ensures that the ambulance remains in a safe zone, away from potential hazards or further collapses.
Moreover, it guarantees that the emergency responders have enough space to safely operate and coordinate a rescue without the ambulance obstructing access or becoming part of the problem.