Final answer:
When performing oral care on an unconscious client, the nurse aide should place the client in the lateral position.
Step-by-step explanation:
When performing oral care on a client who is unconscious, the nurse aide should place the client in the lateral position. The lateral position is when the client is lying on their side, with their head, neck, and body in a straight line. This position helps to prevent aspiration and allows for proper drainage of oral secretions.