A nurse enters a school age child's room to administer morning medications and finds the client sitting in a chair having a seizure. After lowering the client to the floor, which of the following actions should the nurse take first?

A. Apply oxygen by nasal cannula: Applying oxygen can be beneficial but is not the immediate priority during an active seizure. Protecting the airway comes first. B. Turn the client to a lateral position: This action prevents aspiration by keeping the airway clear if the client vomits or has excessive secretions. C. Administer an anticonvulsant medication: Medications may be necessary later, but immediate safety and airway protection take precedence. D. Check the client’s oxygen saturation: Monitoring oxygen saturation is important but should follow positioning to ensure airway protection.