The answer is D.
When you look for any evidence on about how much the traditional family is eroding, you might point to the fact that singlehood is up, the divorce rate is up, and more children are born to single mothers. Before the traditional family is defined as a family in middle-class with the father as the breadwinner and the mother is stayed-at-home. They are married to and raised together their biological children. But now, this type of family has become less dominant, and other family systems have become more common.