Answer: b. thoracic
Step-by-step explanation:
A vertebral column is also called as backbone in human skeleton. It forms the part of axial skeleton. It includes a verticle series of bones which covers and protects the spinal cord. It includes 33 vertebral bones like 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 4 coccygeal bones.
On the basis of this description, thoracic region exhibit most vertebrae.