A 6-week-old boy ,is seen by his physician in Hyderabad. His parents repo that he has not had significant use of his right arm since bih. Bih history is significant for a prolonged labor with difficult breech delivery. On physical examination, his arm hangs at his side and is in a medially rotated position with the forearm in pronation. He will actively use his left arm, but does not move his affected right arm or hand. Injury to which of the following cervical nerve roots account for this patient's posture?