Final answer:
The nerves that connect to the brain are called cranial nerves, and there are twelve of them with various functions. The correct answer to the question is Cranial nerves.
Step-by-step explanation:
The nerves that connect to the brain are known as cranial nerves. There are twelve cranial nerves, and they can be sensory, motor, or a combination of both. These nerves are distinct from spinal nerves, which connect to the spinal cord and are mixed nerves with both sensory and motor fibers. Spinal nerves have a regular arrangement and include sensory axons entering the spinal cord as the dorsal nerve root and motor fibers emerging as the ventral nerve root. Therefore, the correct answer to the question is D) Cranial nerves.