With Regard to Single-Parent Families in the United States

With regard to single-parent families in the United States,

A) more of these families are the result of divorce than of the mother never having been married.
B) very few children are born outside marriage and live in a single-parent household from birth.
C) the classification of "single-parent household" often includes other adults, such as the unmarried partner of a child's parent.
D) children living with remarried parents usually live with the biological father.