If A is the initial amount put into an account, R is the annual percentage of interest written as a decimal, and the interest compounds annually, then which of the following would be an expression, in terms of A and R, for the interest accrued in three years?
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A$$A(R)^{3}$$
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B$$A(R+R^{3})$$
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C$$A(3R+3R^{2}+R^{3})$$
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D$$3A(R)^{3}$$
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E$$3A(R+R^{2}+R^{3})$$
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正确答案: C