When is it appropriate to give oral fluids to a casualty?

The correct choice relates to when a casualty can safely receive oral fluids. It is essential that a casualty is conscious and able to protect their airway before administering any oral fluids. If a person is unconscious or unable to protect their airway, giving them fluids can lead to choking or aspiration, which can result in more severe complications.

In contrast, administering oral fluids should not occur when a casualty is unconscious or lacks the ability to swallow safely. This is critical for ensuring the safety and well-being of the individual receiving care. While hydration is important, the priority must be the casualty's ability to safely consume fluids without risk of airway compromise.