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【单选题】
酒精本身没有明显的致癌能力。但是许多流行病学调查发现，喝酒与多种癌症 的发生风险正相关——也就是说，喝酒的人群中，多种癌症的发病率升高了。 以下哪项如果为真，最能支持上述发现？A.
酒精在体内的代谢产物乙醛可以稳定地附着在 DNA 分子上，导致癌变或者突变
B.
东欧地区广泛食用甜烈性酒，该地区的食管癌发病率很高
C.
烟草中含有多种致癌成分，其在人体内代谢物与酒精在人体内代谢物相似
D.
有科学家估计，如果美国人都戒掉烟酒，那么 80%的消化道癌可以避免
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