Which item is required as a lifesaving aid in the pool?

The requirement for two buoyant throwing aids is based on established safety protocols in aquatic environments. These aids are essential for providing immediate assistance to swimmers in distress, as they can be thrown to individuals who are unable to reach safety. Having two aids ensures that lifeguards or trained personnel can effectively serve more than one person if necessary, which is crucial in emergencies where multiple individuals might need assistance.

The other options, while related to water safety, may not align with the specific lifesaving aid requirements. A life jacket for each bather can be beneficial but is not always required, as some facilities may allow only proficient swimmers to enter certain areas. A flotation ring that can hold multiple bathers is practical but does not meet the standard for individual throwing aids. Lastly, a life raft is typically not designed for use in pools; it is better suited for open water rescue situations. Thus, the best choice for a lifesaving aid specifically required in a pool environment is two buoyant throwing aids.