The right answer is C. It consists of the bones that form ...
The appendicular skeleton is the skeleton of the limbs. This skeleton is related to the vertebral column thanks to the zonal skeleton.
The zonal skeletons allow connecting the limbs to the spine. We distinguish the pectoral belt in the front position and the pelvic girdle. Poorly developed in Pisces, they gain importance in the conquest of the air environment. Water no longer supporting the weight of the body, it is the belts to take care of it. They must, therefore, be solid while allowing locomotion.