Which one of the following is showing the correct sequential order of vertebrae in the vertebral column of human beings ?
A. Cervical- lumbar- thoracic- sacral - coccygeal
B. Cervical- thoracic- sacral-lumbar- coccygeal
C. Cervical- sacral - thoracic-lumbar- coccygeal
D. Cervical- thoracic- lumbar- sacral- coccygeal