The first answer is D, autotrophs produce organic molecules. An example of an organic molecule is glucose, and during the process of photosynthesis, autotrophs (organisms that make their own food) create glucose (or sugar, an organic molecule).
The second answer is A. Since the reactants of respiration are the products of photosynthesis, respiration needs photosynthesis to produce oxygen and glucose so they can interchange that into carbon dioxide and water, which is needed to start photosynthesis! They both rely on each other, the products of photosynthesis are the reactions for respiration, and the products for respiration are the reactants for photosynthesis.
