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【单选题】
对下图所示的蜂窝煤燃烧进行如下的探讨，并得出相应的正确解释。其中依据质量守恒定律解释的是（ ）A.
煤燃烧完后煤灰质量比煤的质量轻。解释：煤燃烧后产生CO 2 等气体逸出
B.
在煤炉上方放一壶水不能防止CO中毒。解释：CO难溶于水
C.
将煤做成蜂窝状就更易燃烧。解释：蜂窝状的煤与空气接触面积增大
D.
煤燃烧正旺时将炉门关上，煤的上方火焰呈蓝色。解释：此时O2不足且产生的CO在燃烧
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A.
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