Final answer:
Afferent nerves or fibers are found only in the sensory nervous system.
Step-by-step explanation:
Afferent nerves or fibers are found only in the sensory nervous system. The sensory nervous system, which is a part of the peripheral nervous system, is responsible for transmitting sensory information from the body to the central nervous system. Afferent nerves carry sensory information from the sensory organs, muscles, and skin to the brain and spinal cord. Therefore, option A, sensory, is the correct answer.