conduct a controlled experiment discuss the statement with other students ask several teachers their thoughts propose a scientific conclusion
I gave my students this multiple choice question: A student states that plants grow taller when grown in natural light than they do in artificial light. Which method is the best way to determine if the statement is fact or opinion?

Only one answer is correct among these 4 choices:
- conduct a controlled experiment
- discuss the statement with other students
- ask several teachers their thoughts
- propose a scientific conclusion

Could you tell me which one is correct?

conduct a controlled experiment