Which of the following is NOT a sign of drowning?

The choice indicating "Able to inflate buoyancy compensator and relax" stands out as the correct answer because it signifies a diver's control and ability to manage their buoyancy, which is inconsistent with the signs of drowning. In a drowning situation, a person typically exhibits distress and struggles for air, displaying signs of panic and an inability to manage their situation effectively.

Being able to inflate a buoyancy compensator and relax suggests that the individual is capable of remaining calm and has the necessary skills to manipulate their equipment, which is the opposite of what occurs during a drowning episode. The other signs, such as flailing arms, gasping for air, and weak struggles, are all indicative of someone in distress, unable to cope with their circumstances. These behaviors are common in drowning situations, reflecting panic and the instinctual struggle for survival.