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题目材料：
People at the income level under $10,000 who moved abroad moved to $$x$$ different countries, and people at the $10,000-$29,999 income level who moved abroad moved to y different countries, of which $$z$$ countries are also among the $$x$$ countries. For all of these countries and for the people at these two income levels who moved to these countries, which of the following represents the average number of people per country?
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A.$$\frac{1,869,000-z}{x+y}$$
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B.$$\frac{1,869,000}{x+y-z}$$
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C.$$\frac{2,472,000-z}{x+y}$$
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D.$$\frac{2,472,000}{x+y}$$
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E.$$\frac{2,472,000}{x+y-z}$$
E显示答案
