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.
Are you talking like a college degree? A little confused on the question but you need to take college courses and on the job training for a little bit before you get the degree.