Here's a problem to solve: A scientist conducts an experiment on the growth rate of a specific species of plant. Which of these is needed for the data to be relied upon by other scientists?

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

- A: The investigation must use many variables.
 
- B: Equipment used in the investigation must be new.
 
- C: Results of the investigation must be recorded accurately.
 
- D: The investigation needs to be performed by well-known scientists.
 