The opponent-process theory of color vision is based on the idea that the retina contains

The opponent-process theory of color vision is based on the idea that the retina contains

A. three types of simple receptors sensitive to red, green, and blue.
B. three types of receptors, two sensitive to color and one to differences in brightness.
C. three sets of cells responsive to brightness.
D. three types of receptors responsive to primary colors.

Correct answer is option B. Explanation: The opponent-process theory of color vision is based on the idea that the retina contains three types of receptors, two sensitive to color and one to differences in brightness.