Final answer:
The correct answer is D) Thoracic, 12, as the thoracic region of the spinal column has 12 vertebrae.
Step-by-step explanation:
The question relates to the anatomy of the spinal column and the number of vertebrae in each region. Based on anatomical facts, the correct answer choice that matches the region of the spinal column with the number of vertebrae in that region is D) Thoracic, 12.
The cervical region comprises seven vertebrae, the thoracic region has 12 vertebrae, the lumbar region contains five vertebrae, the sacral region is made up of five fused vertebrae forming a single sacrum, and the coccygeal region (the tailbone) arises from the fusion of four small coccygeal vertebrae.