Here's a problem to solve: Students from two classes conducted the same investigation. Each class got different results. Which is the best way for the students to determine why the results were different?

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

- A: Review the steps taken during the investigations.
 
- B: Change the hypothesis of the investigation.
 
- C: Research data on similar investigations.
 
- D: Conduct a different investigation.
 