I believe it is B. Hope this helps!!
Answer:
photosynthesis produces glucose which is stored as starch in the plant.
Explanation:
6H₂O + 6CO₂ -----> C₆H₁₂O₆ + 6O₂(as a waste product for plants)
Photosynthesis reduces carbon dioxide in the atmosphere which reduces the green house gasses in the atmosphere which reduces the green house effect.
