CO2 is used to produce water. CO2 is absorbed by mitochondria. CO2 and H2O are converted to carbohydrates. CO2 and H2O are combined into carbonic acid.
I gave my students this multiple choice question: Which of the following occurs during photosynthesis?

Only one answer is correct among these 4 choices:
- CO2 is used to produce water.
- CO2 is absorbed by mitochondria.
- CO2 and H2O are converted to carbohydrates.
- CO2 and H2O are combined into carbonic acid.

Could you tell me which one is correct?

CO2 and H2O are converted to carbohydrates.