A 54 year old man with a long history of smoking is diagnosed with squamous cell carcinoma of the larynx. During the course of a radical neck dissection to remove the tumor and regional lymph nodes, the spinal accessory nerve is severed. As a result, the man would most likely have the greatest difficulty in?
Abducting the arm Adducting the arm Elevating the point of the shoulder (shrugging) Laterally rotating the arm