Which nerve is most likely related to his symptoms?

A 20 year-old male athlete complains of pain and weakness of his right arm. He had a successful surgery on his knee last week. He has been walking with the aid of crutches since then. On examination, he is unable to extend his right arm at the elbow or the hand at the wrist. There is also a sensory deficit over the dorsolateral area of the right hand. Neurological examination is otherwise normal.
Which nerve is most likely related to his symptoms?

A-Axillary nerve
B-Median nerve
C-Radial nerve
D-Suprascapular nerve
E-Ulnar nerve