The investigation must use many variables. Equipment used in the investigation must be new. Results of the investigation must be recorded accurately. The investigation needs to be performed by well-known scientists.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: 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?
Possibilities:
- The investigation must use many variables.
- Equipment used in the investigation must be new.
- Results of the investigation must be recorded accurately.
- The investigation needs to be performed by well-known scientists.

Results of the investigation must be recorded accurately.