Answer:
The chemical process is C. Photosynthesis.
Explanation:
Chlorophyll are organelles in plant cells that execute the chemical process to convert sunlight, CO2 and water into sugar and nutrients, and are not the process itself.
Gametophytes are the sexual phase of plants and certain algae, and are definitely not a chemical process that plants use to create food.
Sporophytes are one of the life stages in the life cycle of a plant or alga. Hence, it is definitely not a chemical process either.
Therefore, the answer is C. Photosynthesis. It is a chemical process that plants use to create their own food, and is the chemical process that chlorophyll execute to create food.
Hope this helped!