Two theories together account for color vision. The YoungHelmholtz trichromatic theory shows that the eye contains , _____________________and the opponent-process theory accounts for the nervous...

Two theories together account for color vision. The YoungHelmholtz trichromatic theory shows that the eye contains
, _____________________and the opponent-process theory accounts for
the nervous system’s having___________ .
a. opposing retinal processes; three pairs of color receptors
b. opponent-process cells; three types of color receptors
c. three pairs of color receptors; opposing retinal processes
d. three types of color receptors; opponent-process cells