Please choose the correct answer to the question: The day before the class is going to do a lab experiment, their teacher reminds them not to wear open shoes to school the next day. Which rationale best explains their teacher's request?

Answer1: to prevent spills of chemicals Answer2: to prevent injury to toes or feet Answer3: to keep them from getting tired feet Answer4: to keep them grounded in case of shock

Answer format: answer1/answer2/answer3/answer4