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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$$\frac{(100)(6x+29y)}{x+y}$$
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