Which of the following is a characteristic lifeguards must possess?

Quick thinking ability is essential for lifeguards because they often face unpredictable situations that require immediate and effective responses. Lifeguards must maintain heightened awareness and be prepared to act quickly in emergencies, such as rescuing swimmers in distress, administering first aid, or coordinating with emergency services. The ability to assess a situation rapidly allows them to make sound decisions under pressure, which can be the difference between life and death in critical circumstances. This skill encompasses not only response time but also the capacity to evaluate risks and determine the best course of action swiftly.

In contrast, while being able to swim fast is indeed beneficial, it is not the sole or most crucial trait required. Knowledge of finance and the ability to manage fitness programs, while valuable skills in different contexts, are not directly relevant to the core responsibilities of a lifeguard, which focus on safety and emergency response.