How does the opponent-process theory explain the phenomenon of afterimages, such as seeing a blue afterimage when staring at a yellow object?

• A. Afterimages are the result of the primary color's signal being strengthened over time.
• B. Afterimages appear because the visual system temporarily enhances the perception of the primary color's complementary color.
• C. Afterimages occur as the visual system fatigues from processing the primary color and enhances the complementary color.
• D. Afterimages are unrelated to the opponent-process theory and are caused by external factors.

Answer: (C)