Which one of the following statements is true:
A. Head of humerus bone articulates with acetabulum of pectoral girdle
B. Head of humerus bone arti~ulates with " glenoid cavity of pectoral girdle
C. Head of humerus bone articulate with a cavity called acetabullum of pelvic girdle
D. Head of humerus bone articulates with a glenoid cavity of pelvic girdle.
