The correct option is D Pectoral girdle
The scapula is a large triangular flat bone situated in the dorsal part of the thorax between the second and the seventh ribs. The dorsal, flat, the triangular body of scapula has a slightly elevated ridge called as the spine which projects as a flat, expanded process called as the 'acromion'. The clavicle articulates with this. Below the acromion is a depression called as the 'glenoid cavity', which articulates with the head of the humerus to form the shoulder joint.