Answer: D
Explanation: The five neuron types of the Retina are Bipolar cells, Ganglion cells, Photoreceptor cells, Horizontal cells and Amacrine cells.
The Ganglion cells generate action potentials, when a ganglion cell is depolarized to a certain degree, regenerative sodium spikes become apparent. The result is that a ganglion cell will fire action potentials at a mass influx into the optic nerve to the brain.