option A is very correct, what is skeleton, skeleton is the bony frame work which give support, shape, movement and protection to the soft tissue in the body.forms of skeleton include chitin, cartilage and bone, types of skeleton, endo skeleton, exo skeleton and fluid skeleton, type of endo skeleton include axial and appendicular skeleton, axial skeleton include skull and vertebral column, skull consists of facial bone, cranium, and jaw. while vertebral coloum consist of thoracic, lumber, sacra, caudal, cervical coloumn, appendicular consist of limbs and limbs girdle.