12. Choose the answer that describes the hierarchy among these three body regions.
O A. The oral region is part of the facial region, and the facial
region is part of the cephalic region.
O B. The cephalic region is part of the facial region, and the facial
region is part of the manual region.
O C. The oral region is part of the cephalic region, and the
cephalic region is part of the facial region.
O D. The cephalic region is part of the facial region, and the facial
region is part of the oral region.