Which of the following is true according to the opponent-process theory of color vision.

A. Red and green receptors cannot be simulated simultaneously; if one is activated another is inhibited.

Explanation: According to the opponent process theory of color vision given by Ewald hering, how a man recognize the colors is direct by three opposing system. The three opposing pair of colors are red and green, blue and yellow and black and white. the activation if one color will inhibit the other one.

the first one is d and the second a

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