Answer:
d. the tendency to choose a mate with similar personal characteristics.
Explanation:
Endogamy was common in ancient times to preserve the blood, the similarities between the members of the family, and the dynasties. However, this practice was dangerous because of the possibility of creating a generation of members with some kind of genetic disease or malformation.
I believe the answer is: Borderline personality disorder
People with borderline personality disorder tend to have inconsistent image, moods, and behaviors.
This situation often caused the people around the victims to have a very hard time in adjusting and accepting their behavior and make it very hard for the victim to develop meaningful relationship.
