The cephalocaudal principle dictates that
A. development proceeds from the head to the lower part of the trunk.
B. the embryo develops from the left to the right, except for left-handed ones, which develop from right to left.
C. the embryo develops the outer organs first and then fills out from the inside.
D. an embryo's finger and toes develop earliest and are disproportionately large until the trunk and arms catch up.