Final answer:
The cell bodies of afferent neurons are located in the dorsal root ganglia, which house the sensory neurons as indicated by Figure 13.19 and the organization of spinal nerves.
Step-by-step explanation:
The cell bodies of afferent neurons, which are sensory neurons, are located within the dorsal root ganglia. This is supported by the fact that the dorsal root ganglia contain unipolar neuron cell bodies, which are sensory neurons as seen in photomicrograph studies like those in Figure 13.19. Spinal nerves contain both sensory and motor axons, with the sensory neuron cell bodies grouped in the dorsal root ganglia and motor neuron cell bodies found in the ventral portion of the gray matter of the spinal cord. Therefore, the answer to the student's question is E) dorsal root ganglia.