Which of the following responses would be appropriate when witnessing a diving accident?

When witnessing a diving accident, the most appropriate response is to call for help and assess the situation. This approach emphasizes the importance of ensuring both your safety and the safety of the victim. Before taking action, it's crucial to evaluate the circumstances of the accident—such as the depth of water, the victim's condition, and any potential hazards that may pose a risk to you or the victim.

Calling for help ensures that trained professionals are alerted to the emergency, who can provide assistance that is often necessary in such critical situations. Assessing the situation involves observing the victim’s condition from a safe distance, which can include checking for breathing or consciousness without putting yourself in danger. This step is vital, as rushing in without a proper assessment could lead to further complications or put the rescuer at risk of injury.

In contrast, the other options do not promote the best safety practices. Staying silent and observing does not contribute to resolving the emergency effectively, while jumping in immediately could endanger the rescuer if they are not trained to handle underwater emergencies. Moving the victim to shore is usually not advisable until they have been assessed, as it can potentially exacerbate any injuries they may have sustained.