According to the opponent-process theory of color vision, the three types of color receptors are:

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The opponent-process theory of color vision proposes that there are three types of color receptors, each of which has an opposite or opponent color. The opponent colors are red versus green, blue versus yellow, and black versus white. This theory explains why we cannot perceive reddish-green or bluish-yellow colors, as well as why staring at a certain color for an extended period can result in the perception of its opposite color (e.g., staring at a green image for a while and then looking at a white surface will result in a red afterimage). Choice A is the only option that correctly lists the opponent colors according to the opponent-process theory.

According to the Opponent-Process Theory of Color Vision, the Three