Answer:
Probably C) Conducting the experiment again
Step-by-step explanation:
Option A is wrong because there is a chance that the group of researchers made a mistake or got the wrong data. So when interviewing the researchers, there is a chance of them giving the wrong data, especially since the experiment has never been conducted before.
Option B is wrong because the experiment the researchers where doing was new and has never been conducted before. Therefore there is no older research done on that topic.
Option C is correct because when conducted the experiment again, they can compare their results with the group of researchers. Checking if the data is correct.
Option D is wrong because the group of researchers might have made a mistake when writing down the procedure, leading to false data.