Final answer:
The correct answer to what the pectoral girdle contains is D) scapula, as it is part of the pectoral girdle along with the clavicle.
Step-by-step explanation:
The human pectoral girdle, an integral component of the skeletal system, consists of two primary bones: the clavicle (collarbone) and the scapula (shoulder blade). These bones are crucial for connecting the upper limbs to the axial skeleton. The clavicle is positioned anteriorly and functions as a supportive strut, connecting the scapula to the sternum in the front of the body. On the other hand, the scapula is located posteriorly on the back and plays a key role in the articulation with the humerus, the upper arm bone, at the shoulder joint.
In response to the question regarding the content of the pectoral girdle, the correct answer is D) scapula. The scapula's posterior placement and its involvement in the shoulder joint make it an essential element of the pectoral girdle, contributing to the overall structure and mobility of the upper limb.