When identifying an unresponsive drowning person in the water, what should you look for?

In the context of identifying an unresponsive drowning person, observing whether the individual lifts their head to breathe is crucial. A person who is actively struggling for air typically attempts to lift their head or make movements that indicate they are trying to breathe. This behavior is indicative of a potential response to distress in water and does not align with the signs of complete unresponsiveness.

The other options relate to different aspects that may not effectively indicate unresponsiveness. For example, looking for a lack of bubbles is an observation that may not provide clear information about the person's state, and rising and falling movements might occur if the person is still able to engage, even minimally, with the water. Similarly, any visible movements might include those from another person or environmental factors, rather than being specific to the individual in distress. Therefore, focusing on whether they are attempting to breathe or show signs of consciousness is the most accurate way to assess if someone is unresponsive in a drowning scenario.