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题目材料：
The ratio of the total annual residential energy usage to the total annual commercial energy usage is $$x$$ to $$y$$. Which of the following represents the fraction of the total annual energy usage, both residential and commercial, that is for lighting?
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A.$$\frac{x+y}{6x+29y}$$
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B.$$\frac{x+y}{(100)(6x+29y)}$$
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C.$$\frac{6x+29y}{(35)(x+y)}$$
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D.$$\frac{6x+29y}{(100)(x+y)}$$
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E.$$\frac{(100)(6x+29y)}{x+y}$$
D显示答案
