单选题：Single—parent Families Today we tell about the m ajor change

Single—parent Families
Today we tell about the m ajor change in the American family．It is the increase in the number of families with only one parent．
（1）．One 0f the reasons for this is the increasing number 0f women who have children without being married．The United States Census Bureau recently released a new report 0n the situa tion． 2）．It said 24 percent of them had at least one child．Almost 4 million unmarried women in the United States are mothers．This is an increase of alnIost 60 percent in the past 10 years．
（3）．In the past，women were expected to marry and remain home with their children．They depended on their husbands to earn money to support the fmnily．Experts say women were pushed into marriage by many parts of Anierican society． （4）．
（5）．They say American women have fewer economic reasons for marrying than they did yearn ago．This is because more women work outside the honle today than in the past，and there is less of difference between