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题目材料：
Which of the following is closest to the fraction of the families with students in four-year public colleges who do not use income or savings as the main source to pay for college expenses?
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A.$$\frac{5}{9}$$
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B.$$\frac{2}{3}$$
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C.$$\frac{7}{10}$$
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D.$$\frac{3}{4}$$
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E.$$\frac{4}{5}$$
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