What should a lifeguard do if they spot a distressed swimmer?

When a lifeguard spots a distressed swimmer, the appropriate action is to signal for assistance and perform a rescue if they are trained to do so. This course of action is correct as it prioritizes the safety of the distressed swimmer, ensuring that help is on the way quickly while the lifeguard takes immediate steps to assist the individual.

Reacting promptly can be critical in such situations; a swimmer in distress may struggle to keep afloat, increasing the risk of drowning. The lifeguard's training equips them with the skills and protocols necessary to approach the situation safely and effectively, including assessing the swimmer's condition, determining the safest rescue method, and maintaining communication with other lifeguards or emergency services.

The other options do not prioritize the swimmer’s safety. Ignoring the swimmer can lead to dire consequences, as distress may quickly escalate into a life-threatening emergency. Monitoring other beachgoers without addressing the distressed swimmer is reckless as it neglects an immediate threat to someone's life. Alerting local authorities without taking any action could result in delays that may worsen the situation, as help may not arrive in time to intervene effectively. Thus, taking action by signaling for help and preparing to rescue is critical in safeguarding the swimmer and ensuring their wellbeing.