Answer:
The answer is: letter A, Naturalistic Observation
Explanation:
Naturalistic Observation is one of the research methods that is used in order to study the subjects in their natural habitat (environment). This is being conducted when the laboratory experimentation is deemed unrealistic. The normal reaction of the subjects in the real world are being studied here. So, one way to do this is by setting up a "hidden camera" in order to record the subjects' behaviors. However, one disadvantage of this is the difference is conclusion that every researcher has about the behavior they have witnessed. Thus, it results into clashes of causative factors.
Thus, this explains the answer.
