Final answer:
The arm and leg bones are part of the Appendicular skeleton, which also includes the pectoral and pelvic girdles that attach the limbs to the axial skeleton.D) Appendicular
Step-by-step explanation:
The section of the skeleton that includes the arm and leg bones is known as the Appendicular skeleton. This division of the skeletal system encompasses all the bones of the upper and lower limbs, along with the bones that secure each limb to the axial skeleton, which includes the skull, vertebral column, and thoracic cage. The Appendicular skeleton boasts 126 bones in the adult human body and is split into two categories: the limb bones themselves and the girdle bones that link the limbs to the axial skeleton. The pectoral girdle connects the upper limbs to the thoracic cage, while the pelvic girdle attaches the lower limbs to the vertebral column.