The Increase in the Number of Working Mothers, the Number

The increase in the number of working mothers, the number of single-parent families, and divorce over the last fifty years has probably been instrumental in changing the way children in the United States are socialized, because

A) children are spending less and less more time in school.
B) the impact of institutions other than the family in the socialization of children has become more profound.
C) school has always been the primary socializing institution in the lives of children.
D) the median income of families has improved dramatically as a consequence of second incomes in most families.