Please choose the correct answer to the question: If a classroom experiment involves the use of several unidentified chemical solutions, which factor would be most important in maintaining safety during the experiment?

Answer1: The classroom would be fairly cold. Answer2: The classroom would have poor lighting. Answer3: The classroom would have good ventilation. Answer4: The classroom would have carpet on the floors.

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