Please show us the list you're referring to.
Since its dealing with economics I would say C.
Answer:
B. It shows that animals depend on this process for oxygen.
Explanation:
Photosynthesis is the process by which plants use sunlight to make food from carbon dioxide and water which are given off by animals. The reaction of photosynthesis causes oxygen gas to be released, which is vital for animals as they cannot breathe without it.
Hope that helps.
