Answer:
The correct answer is option b. they must occur under carefully controlled conditions found in the laboratory.
Explanation:
Scientific experiments are well organized and step by step method to validate or test if a hypothesis is valid or not. It includes observation, test, analysis of the data and conclusion. The results are always useful even if hypothesis rejects.
Every experiment should be well documented to establish and reviewing purposes. It is not a compulsion for a scientific experiment to take place in the lab in controlled conditions.
Thus, the correct answer is option b. they must occur under carefully controlled conditions found in the laboratory.
