Answer:
Labeling theory
Explanation:
Labeling theory argues that a person's behavior and identity may be influenced by the term they are classified or described with. Therefore, a person will most likely act out how he/she is classified. So, when a individual is classified as "deviant", it could lead to that individual engaging in the deviant behavior, hence affecting the social identity of the individual.
Therefore the study of the sociologist illustrates labeling theory.