In Order to Maximally Stimulate a Retinal Ganglion Cell with an On-Center

Multiple Choice

In order to maximally stimulate a retinal ganglion cell with an on-center receptive field, a spot of bright light should strike:

A) both the center and the surround of the entire receptive field.
B) the entire center of the receptive field without touching the surround.
C) only the surround of the receptive field.
D) neither the center nor the surround of the receptive field.