n small balls with radius r were put into a cylinder filled with water, and the small balls were completely submerged in the water. The radius of the bottom circle of the cylinder is 4r, and the height of water before and after putting the balls is $$h_1$$ and $$h_2$$. How to express the difference of $$h_2$$ and $$h_1$$ with n and r?
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A$$\frac{nr}{3}$$
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B$$\frac{nr}{4}$$
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C$$\frac{nr}{6}$$
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D$$\frac{nr}{8}$$
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E$$\frac{nr}{12}$$
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正确答案: E