Which of the following is NOT a recommended course of action during a seizure?

The correct answer highlights a critical aspect of first aid for individuals experiencing seizures. During a seizure, placing something in the mouth of the person is highly discouraged and could actually cause significant harm. This can lead to dental damage, choking, or injury to both the individual experiencing the seizure as well as the person providing assistance.

In contrast, the other suggested actions are appropriate and recommended during a seizure. Protecting the victim from self-inflicted injury involves ensuring that the surroundings are clear of sharp objects or potential hazards. Monitoring the airway is crucial to ensure that the person can breathe and to prevent aspiration. Placing a pillow under the person's head can help cushion their fall and minimize the risk of head injury. Each of these actions aims to provide a safer environment and support for the individual experiencing the seizure.