Which of the Following Statements About Family Systems Is True

Which of the following statements about family systems is True?

A) Polygyny is a more common form of marriage than polyandry.
B) Serial monogamy is a form of marriage found only in Western cultures.
C) Polygamy was completely eradicated from the United States during the twentieth century.
D) In the United States, the married couple with unmarried children is the most common family structure.