单项选择题

()是肩部的主肌肉

A.三角肌,冈上肌,冈下肌,肩胛下肌
B.肩胛下肌,三角肌,冈上肌,冈下肌,胸大肌
C.三角肌,肱二头肌,肱三头肌,胸大肌
D.冈上肌,肱二头肌,肱三头肌,冈下肌