Final answer:
The correct number of pairs of spinal nerves is eight cervical, twelve thoracic, five lumbar, five sacral, and one coccygeal; hence, option 2 (twelve thoracic) is correct.
Step-by-step explanation:
The human spinal cord is connected to a specific number of spinal nerves at various levels. These spinal nerves are named according to where they emerge from the spinal cord and through the vertebral column. There are eight pairs of cervical nerves (C1 to C8), twelve thoracic nerves (T1 to T12), five pairs of lumbar nerves (L1 to L5), five pairs of sacral nerves (S1 to S5), and one pair of coccygeal nerves.
Therefore, the correct number of pairs of spinal nerves for the cervical region is eight, not six as mentioned in option 1. Consequently, among the given options, the correct number of spinal nerve pairs is the twelve thoracic nerves as mentioned in option 2.