a. Head of humerus bone articulates with the acetabulum of the pectoral

girdle.

b. Head of humerus bone articulates with the glenoid cavity of

the pectoral girdle.

c. Head of humerus bone articulates with the acetabulum of the pelvic

girdle.

d. Head of humerus bone articulates with a glenoid cavity of the pelvic

girdle.

correct option –( b )

explanation – Head of humerus bone articulates with the glenoid cavity of

the pectoral girdle.

hence correct answer is Head of humerus bone articulates with the glenoid cavity of

the pectoral girdle.