The correct option is D centrum
The vertebral column consists of 26 bones known as vertebrae.
The anterior portion of the vertebra is disc like and flattened, known as the centrum/body.
The posterior portion of the vertebra is called the neural arch.
The hollow centre is called the vertebral foramen which is formed by the neural arch. There are 24 vertebral foramina known as vertebral canal/ neural canal. The spinal cord passes through it.