【单选题】

The passage is primarily concerned with
A．(A) illustrating the extent to which the physiological principles behind taste mirror those behind vision

B．(B) contrasting the available evidence for the labeled-line and across-neuron theories of taste
C．(C) describing the evolution of theories concerning the neurological mechanisms which determine taste
D．(D) demonstrating the superiority of holistic models over component models in analyzing neuron function
E．(E) showing that individual neurons play a negligible role in the physiological mechanisms of perception