I think it's the third option. Not entirely sure though.
This change is a result of "contact hypothesis".
The contact hypothesis has been portrayed as a standout among other approaches to enhance relations among people that are encountering conflict. Gordon W. Allport is frequently credited with the presentation of the contact hypothesis. The preface of Allport's hypothesis expresses that under suitable conditions interpersonal contact is the best approaches to decrease prejudice among larger part and minority group individuals.
The correct answer that would best fit the given statement above would be option D. The concept model is the most recognized model for explaining how concepts are formed. The conceptual model serves as a representation which is made of the concepts in order to assist the audience to know, understand and simulate a subject that the model represents.
I think the answer to that is being bias