In Much of the Western World,choice of a Marriage Partner

In much of the Western world,choice of a marriage partner is influenced by age,education,class,race,and religion.Which of the following explains this tendency?

A) Marriage outside one's social group is forbidden by law in several Western nations.
B) People are often attracted to others who are opposite in these traits.
C) Marrying someone significantly different in age,race,social class,and religion is often met with disapproval from others.
D) We tend to prefer people who do not resemble our parents' social backgrounds.