The different absorbance spectra expressed by the three types of cone photoreceptors found in the human eye result from differences in:

A)The number of disc membranes found in the cone outer segments.
B)The stereoisomers of vitamin A found in the cone outer segments.
C)The type of opsins found in the cone outer segments.
D)The number of cyclic guanosine monophosphate (cGMP)-gated channels found in the cone inner segments.
E)The types of bipolar cells with which they synapse.