Which of the following is necessary for a lifeguard's emergency kit?

A spinal board is a crucial component of a lifeguard's emergency kit because it is specifically designed to assist in the safe extraction and stabilization of a victim who may have a spinal injury. In emergency situations, it is vital to minimize any movement of an injured person to prevent further injury. The spinal board provides support and allows for safe transportation of the individual, ensuring that the spine remains aligned and reducing the risk of exacerbating the injury.

While other items, such as a pool float, spare swimsuit, or whistle, may have their own purposes in a lifeguard's duties, they do not directly contribute to the critical care provided during situations involving potential spinal injuries. The presence of a spinal board reflects a well-prepared emergency response protocol, emphasizing the importance of injury prevention and management in aquatic environments.