B) Oxygen and E) Carbon Dioxide
Explanation:
Cellular respiration has a general chemical equation as:
⇒
glucose + oxygen ⇒ carbon dioxide + water
Photosynthesis has a general chemical equation as:
⇒
carbon dioxide + water ⇒ glucose + oxygen
Reactants are on the left side of the equation while products are on the right. You can see that the products in cellular respiration are carbon dioxide and water, these also are the reactants in photosynthesis. So (B) Oxygen and (E) Carbon dioxide are the answers.