What is the overall reaction for photosynthesis? select one: a. 6 co2 + 12 h2o > c6h12o6 + 6 o2 + 6 h2o b. co2 + c6h12o6 > 6 o2 + 6 h2o c. 6 o2 + 6 h2o > 6 co2 + c6h12o6 d. c6h12o6 + 6 o2 > 6 co2 + 6 h2o?

Plants combine water and Carbon dioxide from the air to make glucose for themselves, and giving off oxygen in the process. So CO2 and H2O would be on ther reactant side (left) with O2 and C6H12O6 being on the product side (right).

They are all full and don't need any more electrons in there outer shell.