The most probable and the most likeable answer that you would get by asking this question would be the last option which is factual evidence.
Even when not looking up for the definition of it, factual evidence is an evidence solely based on facts. The information presented which is "Chlorophyll, a chemical that is present in the leaves of plants, helps plants use the energy from sunlight", is an example of the factual evidence. Factual evidences are most likely to be facts proven by science and other fields that is backed up by extensive researches the like.
That's going to be a Bandwagon Appeal. An example of that would be "everyone is doing it, you should too!". Or in your case "Everyone agrees!". Your answer is Bandwagon Appeal.
