Concept:The appendicular skeleton includes the bones of the limbs and the girdles that attach them to the trunk.
Explanation:The human skeleton is divided into the axial and appendicular skeletons.
The appendicular skeleton is made up of the bones that support the appendages.
These include the forelimbs and hindlimbs, together with their supporting girdles.
The pectoral girdle attaches the arms to the trunk.
The pelvic girdle attaches the legs to the trunk.
Therefore, the appendicular skeleton consists of the pectoral and pelvic girdles along with the limb bones.
The skull, vertebral column, and ribs belong to the axial skeleton, not the appendicular skeleton.
Answer:A. pectoral and pelvic girdles.