题目内容：
根据下面资料，回答题 Although the United States covers so much land and the land produces far more food thanthe present population needs, its people are by now almost entirely an urban society. Less than a tenth of the people are engaged in agriculture and forestry (林业), and most of the rest live inor around towns, small and large. Here the traditional picture is changing:every small town may still be very like other small towns, and the typical small town may represent a widely acceptedview of the country, but most Americans do not live in small towns any more. Half the population now lives in some thirty metropolitan areas (large cities with their suburbs, of more than amillion people each--a larger proportion than in Germany or England, let alone France). Thestatistics (统计)of urban and rural population should be treated with caution because so manypeople who live in areas classified as rural travel by car to work in a nearby town each day. Asthe rush to live out of town continues, rural areas within reach oftowns are gradually filled with houses, so that it is hardto say at what moment a piece of country becomes a suburb. But more and more the typical American lives in a metropolitan rather than a small town environment.
If now America has 250 million people, how many of them are engaged in agriculture and forestry? A．About 25 million.
B．More than 25 million.
C．Less than 25 million.
D．Less than 225 million.
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