How should lifeguards perform the "log roll" technique on an unresponsive victim?

The log roll technique is essential when dealing with an unresponsive victim, particularly to maintain spinal alignment and prevent further injury. When lifeguards gently roll a victim onto their side while maintaining spinal stabilization, they are ensuring that the head, neck, and back are kept in a straight position. This is crucial because any rapid or unsupported movement could exacerbate any potential spinal injuries.

The process involves carefully coordinating the movement between lifeguards, allowing for controlled support of the body while ensuring that the victim's airway is positioned properly to facilitate breathing and prevent aspiration. This technique is particularly important in water rescues, where the risk of drowning is high, and maintaining the victim’s airway is a priority.

Performing the roll too quickly or without proper support, as might be suggested by options that imply hasty or unsupported movements, increases the risk of causing further harm. Additionally, attempts to lift the victim directly from the water or to flip them completely disregard any spinal stabilization and can lead to serious complications in case of a spinal cord injury. Thus, option B aligns with best practices in lifeguarding and first aid for managing unresponsive victims safely and effectively.