I think it'd be B.. I might be wrong tho..
The answer is ganglia. As indicated, they house many cell
bodies of afferent and efferent neurons.
Spinal ganglia are located in the dorsal (that contain cell bodies of afferent
neurons) and ventral roots (that house cell body
of efferent neurons) of a spinal nerve.
Specialization is what each cells personal function is, and differentiation is how one cell is different from another in any way
Extinct is correct. When no members of a species remain, the species is said to be extinct.