What tool is used to remove someone from a power source if they are being shocked?

Using a hook, crane, or strap to remove someone from a power source during an electric shock scenario is correct because it allows for a safe method of extraction without direct contact with the injured individual. This method helps to minimize the risk of the rescuer becoming part of the electrical circuit, which can occur if they physically touch the person experiencing the shock. It enables the rescuer to maintain a safe distance from the electric source while ensuring that the victim can be pulled away or lifted out of harm's way efficiently.

In situations involving electrical hazards, using tools that provide insulation or distance is key to ensuring safety. In contrast, other options such as a fire extinguisher or a rubber mat do not effectively address the immediate need to remove someone from a power source. While a safety net may prevent falls, it does not assist in safely disengaging a person from electricity, making the hook, crane, or strap the most appropriate choice in this context.