Final answer:
The sternum consists of the manubrium, body, and xiphoid process, serving as a central anchoring point for thoracic ribs and clavicles.
B is correct
Step-by-step explanation:
The three parts of the sternum are the manubrium, body, and xiphoid process.
The manubrium is the upper portion of the sternum, attaching to the clavicles at the sternoclavicular joints and to the first ribs. The body of the sternum is the elongated, central portion, and it attaches to the ribs 2 through 7. The xiphoid process is the small, cartilaginous structure at the inferior end of the sternum, which becomes ossified with the age. The manubrium and body are joined at the sternal angle, a key anatomical landmark.