The correct response regarding the relationship between photosynthesis and cellular respiration is:
b the products of cellular respiration are the reactants of photosynthesis.
This is because during photosynthesis, plants take in carbon dioxide and water and use sunlight to produce glucose and oxygen. Conversely, during cellular respiration, organisms consume glucose and oxygen to produce carbon dioxide and water, which are then used again in photosynthesis. Thus, the products of one process serve as the reactants of the other.