Answer:
B.) The atoms in the molecules before the photosynthesis reaction were rearranged to create new molecules
Step-by-step explanation:
Choice A and D are just flat out wrong. While choice C seems more opinionated. I don't know the exact facts behind choice C, since it's been a while since the last time I took Bio, but the question asks what can you conclude from the DIAGRAM. Which means that basic test taking skills would rule out choice C, since there's no way that you can determine which element is the most "important" in that diagram—or any scientific diagram tbh lol it'd just be uncharacteristic.