Please choose the correct answer to the question: Scientists are experimenting to develop microbes that can live off surplus electricity and CO2 to produce

Answer1: organic products, such as methane, acetate and butanol as economic biofuels Answer2: less electricity and more CO2 Answer3: solar energy and biofuels in the laboratory Answer4: fewer biofuels like butanol and less CO2

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