Please choose the correct answer to the question: Which of the following occurs during photosynthesis?

Answer1: CO2 is used to produce water. Answer2: CO2 is absorbed by mitochondria. Answer3: CO2 and H2O are converted to carbohydrates. Answer4: CO2 and H2O are combined into carbonic acid.

Answer format: answer1/answer2/answer3/answer4
Answer: answer3