A college athlete presents with shoulder pain. He reports that he was injured during basketball practice 2 days ago when his teammate ran into his shoulder. On physical examination, he has an edematous left shoulder. The clinician passively abducts the patient's shoulders to 90 ° and flexes to 30 ° while asking the patient to point his thumbs down. What muscle is the clinician trying to evaluate?
(A) Supraspinatus
(B) Infraspinatus
(C) Teres minor
(D) Teres major
(E) Subscapularis