What are signs indicating a swimmer may be in trouble?

Recognizing signs that a swimmer might be in trouble is crucial for effective lifeguarding. The correct choice identifies behaviors that clearly indicate distress in the water. When a swimmer is struggling to stay afloat, it shows they are having difficulty managing themselves in the water, which can quickly lead to panic. Panic behavior, such as splashing or flailing, can exacerbate the situation, making it more challenging for them to stay above water. Additionally, sudden changes in swimming patterns, such as moving erratically or stopping altogether, can signal that the swimmer is experiencing difficulties or is overwhelmed.

In contrast, the other choices consist of behaviors that typically reflect a swimmer's comfort and control in the water. For instance, swimming laps or playing with friends usually indicates that a swimmer is enjoying themselves and is confident in their abilities. Similarly, activities such as snorkeling or calmly treading water while responding to lifeguards suggest that a swimmer is not in distress and is competent. The signs of shaking hands or moving slowly may not directly correlate with water safety and do not indicate a swimmer's immediate struggle. Understanding these distinctions helps lifeguards quickly assess situations and take appropriate actions when a swimmer shows signs of trouble.