Which of the following is a sign of someone in distress in the water?

The sign of someone in distress in the water is characterized by their struggle to keep their head above water. This behavior indicates that the person is experiencing difficulty and is unable to remain afloat without considerable effort. Distress in the water can manifest through physical signs such as flailing arms, gasping for air, or visible panic, all of which suggest that the individual may be on the verge of drowning.

In contrast, swimming efficiently is a sign of a competent swimmer, not someone in distress. Making loud noises can sometimes imply playfulness or swimming for attention, rather than distress. Finally, floating on their back is typically associated with relaxation and buoyancy, suggesting that the person is likely not in immediate danger. Recognizing these indicators is crucial for a lifeguard or anyone monitoring water activities, as timely intervention can be lifesaving.