try a different juice analyze the recorded data ask a scientist what went wrong repeat the investigation two more times
I gave my students this multiple choice question: A class tested the amount of vitamin C in fresh orange juice and calculated a different amount than the previous class that conducted the same investigation. What should most likely be done to make sure that their results are accurate?

Only one answer is correct among these 4 choices:
- try a different juice
- analyze the recorded data
- ask a scientist what went wrong
- repeat the investigation two more times

Could you tell me which one is correct?

repeat the investigation two more times