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Scene safety is the first priority in the EMT preparatory domain. Electricity from a downed line can arc unpredictably and conduct through the ground, vehicle, or even damp air. Entering that hazard exposes rescuers and bystanders to fatal electrocution. The correct action is to secure the scene: create an exclusion zone, keep bystanders away, request the power utility to de-energize the line, and stage resources at a safe distance. Only after the hazard is controlled can patient contact begin. Option A violates the prime directive of personal safety. Option C is dangerous and outside EMT scope—improvised manipulation of live wires is never appropriate. Option D compounds risk by involving untrained helpers in a lethal environment. Establishing incident command basics—identify hazards, control the scene, call appropriate resources, and use PPE—is foundational. Rescuers who become victims divert resources and delay care for everyone. Once the utility declares the scene safe, proceed with primary assessment and necessary life support.