By the 2000s, the Traditional Nuclear Family Unit Was Undergoing

By the 2000s, the traditional nuclear family unit was undergoing severe strain because

A) the divorce rate had increased.
B) the number of single-parent households had risen.
C) parent-substitutes had assumed the role of child-rearing.
D) the family no longer served many of its traditional social functions.
E) the family no longer served many of its traditional social functions..