Please choose the correct answer to the question: During photosynthesis, plants absorb light energy from the Sun and convert it into chemical energy in the form of glucose. Which compounds combine in the presence of sunlight to form glucose?

Answer1: carbon dioxide (CO2) and hydrogen (H2) Answer2: oxygen (O2) and carbon dioxide (CO2) Answer3: carbon dioxide (CO2) and water (H2O) Answer4: oxygen (O2) and water (H2O)

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