Answer:
The answer is A.
Explanation:
This is the general reaction for photosynthesis:
6CO2 + 6H2O + light energy --> C6H12O6 + 6O2
This is the general reaction for cellular respiration:
C6H12O6 + 6O2 --> 6CO2 + 6H2O + heat
You can see that the products of photosynthesis are the reactants in cellular respiration.