Final answer:
There are 31 pairs of spinal nerves in the human body, including cervical, thoracic, lumbar, sacral, and coccygeal nerves, responsible for transmitting sensory and motor information.
Step-by-step explanation:
The correct answer to the question "The number of pairs of spinal nerves is" is D. 31. The human body has a total of 31 pairs of spinal nerves that are connected to the spinal cord. These nerves include eight pairs of cervical nerves (C1 to C8), twelve pairs of 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.
Each pair of spinal nerves is responsible for transmitting sensory and motor information between the spinal cord and the corresponding parts of the body. They emerge from the spine at the level of their respective vertebrae: cervical nerves between the cervical vertebrae, thoracic nerves between the thoracic vertebrae, and so on.