While attempting to overcome writers block, Devin stares at her yellow, green, and white striped journal. When she finally returns to her blank computer screen, she sees a blue, red, and black striped afterimage. Which theory best explains the afterimage that Devin sees?
a. negative illusion theory
b. excitation emission theory
c. trichromatic theoryd.
d. opponent process theory

Opponent process theory.

Explanation:

According to the opponent process  theory, our eyes have three color receptors. Each of the three receptor is responsible for perception of two colors: one for white and black, other one for Red and green , the third one for yellow and blue.

We never perceive the paired colors together, and whenever the stimulus for one of the color in the pair is removed we can see the other color of the pair.

If we see the case of Devin as soon as he placed her eyes on the blank computer screen she perceived exactly the opposite color that were present on the magazine. So the afterimage  is best explained by opponent process theory.

17 is the right answer