Answer:
Change the situation
Step-by-step explanation:
Naturalistic research: In psychology, the term naturalistic research is defined as a research in which a researcher observes the subjects or participants involved in the study in his or her natural surroundings or environment.
In the question above, the given statement states that in naturalistic research a researcher can not change the situation as it is basis of the naturalistic research to study participants or subjects exactly the way they behave in their natural environment and any changes in the situation will hinder the result of the research.