Which of the following best exemplifies a swift initial response to a drowning incident?

A swift initial response to a drowning incident is crucial for increasing the chances of survival. Initiating the rescue immediately is the best approach because drowning can lead to unconsciousness and death within minutes. Quick action allows the lifeguard to reach the victim before their condition worsens, giving them the best chance at a favorable outcome.

The other options involve either delaying action or not taking direct intervention, which can heighten the risk of severe outcomes for the drowning person. Waiting for more rescuers or for the victim to resurface can lead to critical time lost, as each second counts in such emergencies. Calling for help without intervening does not address the immediate need to assist the victim, which is the lifeguard's responsibility. Therefore, the correct response emphasizes the fundamental principle of taking swift and decisive action in a life-threatening situation.