What distinguishes true ribs from false ribs?
 A. True ribs are part of the thoracic cage while
 false ribs are not.
 B. True ribs are found in adults and false ribs
 are found in children.
 C. True ribs are made of bone and false ribs are
 made of cartilage.
 D. True ribs connect directly to the sternum
 while false ribs do not.