单项选择题

What is the main topic of the conversation

A．The development of the automobile.
B．Declining air quality.
C．The structure of nitrous oxides.
D．Air quality management.
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US FAMILIES TODAYIn the early days of America, the family held together for economic reasons. Father, mother and children all worked together to build the pioneer family or family business. But today, about one out of three marriages ends in divorce, and more and more of them involve children. The divorce rate in America is still the highest in the world, but GE % of the women and HC % of the men who divorce remarry within C years. The children from the broken families join up to produce a new kind of unit called the blended family. About AH million children are now living with their step-brothers and sisters in such an arrangement. Perhaps the most significant trend today is toward the single-parent household. Of all children under AH, AG% are now living with only one parent. Business and government officials are looking for new ways to help parents meet their family responsibilities as well as to increase their income.
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