A nurse enters the room of a school-age child and finds them on the floor experiencing a tonic-clonic seizure. Which of the following actions should the nurse take?

A. Restraining the child's upper extremities is not recommended during a seizure as it can cause injury. B. Placing a padded tongue blade in the mouth can lead to injury and is not recommended during a seizure. C. Turning the child onto their back is appropriate to ensure a clear airway, but it should be done gently without forcing movements. D. Correct. Placing a pillow under the child's head helps protect their head from injury during the seizure.