Reciprocal Exchange,a Type of Marriage Compensation Rarely Found Today

Reciprocal exchange,a type of marriage compensation rarely found today:

A) emphasized the concept of marriage as an alliance between two families.
B) involved the equal exchange of women between families, allowing long-term alliances.
C) was practiced in very poor societies where there was no material surplus.
D) always involved a slightly higher payment to the groom's family.
E) is currently being revived in areas of southern Africa.