Vernon wonders whether NADPH and ATP should be classified as reactants or as products of
photosynthesis. How should these compounds be classified?
A. As reactants because they are used up by photosynthesis

B. As products because they are generated by photosynthesis

C. As either reactants or products depending on the rate that photosynthesis occurs

D. As neither reactant nor product, because they are recycled instead of made or used up