Rubisco one more time. This time looking at C₃ and C₄ plants. C₃ plants are our everyday easygoing plants. C₄ plants have a specialized approach to prevent photorespiration. What happens in photorespiration? A) Rubisco fixes O₂ in C₄ plants. B) Rubisco fixes both O₂ and CO₂ in C₃ plants. C) Rubisco fixes both O₂ and CO₂ in C₃ and C₄ plants. D) Rubisco only fixes O₂ in all plants.