The two halves of a pectoral girdle consists of a

The correct option is D clavicle and scapula
Pectoral girdle also called shoulder girdle is a part of the appendicular skeletal system. The two halves of the pectoral girdle are made up of clavicle and scapula.
Sternum is a part of the axial skeletal system. It is also called breast bone that is present in the middle of the chest,on the ventral side of the body. It has three parts i.e uppermost (manubrium), middle (body), tip (xiphoid process).