Which nursing intervention takes priority for the client having a tonic-clonic seizure?

A. Inserting a tongue blade is contraindicated as it can cause injury or airway obstruction. B. Maintaining a patent airway is the highest priority to ensure adequate oxygenation during a seizure. C. Timing the seizure is important for documentation but secondary to airway management. D. Noting the origin of seizure activity helps with diagnosis but is not an immediate priority during the seizure.