Final answer:
The student will demonstrate evidence of learning by placing the unconscious patient in the Side-lying position for mouth care to prevent aspiration.
Step-by-step explanation:
The correct position to place an unconscious patient for mouth care is the Side-lying position, option 4. When performing mouth care on an unconscious patient, it is critical to prevent aspiration, which can occur if fluids or debris enter the lungs. The Side-lying position ensures that any fluid in the patient's mouth can drain out to the side, reducing the risk of aspiration, and making it a safer option than the Supine (face up), Prone (face down), or Semi-Fowlers positions.