[单项选择]The traditional two-parent family is fast giving way in the America of the 1980s to households in which one adult must juggle the often enormous demands of making a living and raising children. For many, single parenthood is synonymous with economic need. More than 3 million single-parent families live in poverty, according to The Census Bureau, and joblessness, plus cuts in public assistance, has helped drive up the number of poor children in such families by about 20 percent in Just three years. The biggest burden falls on households that are headed by single mothers. Nearly half of these families are below the poverty "as" the most compelling social fact "of the last 10 years". This deprivation is not only hard on its victims but expensive for taxpayers since single women and their offspring receives 40 to 80 percent of the benefits in various welfare programs that cost the government a total of 40 billion dollars a year. Despite cuts in benefits averaging 10 pe A. Another 3 million of them live in poverty. B. The number of them increased by about 20 percent in just three years. C. The number of them increased by about 3 percent in the 1980s. D. They were not affected at all.