Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: try a different juice
 
- B: analyze the recorded data
 
- C: ask a scientist what went wrong
 
- D: repeat the investigation two more times
 