题目内容：
酸具有共同的性质，是因为（）。
A都能电离出氢离子
B都能使石蕊试液变红
C都能跟碱反应生成盐和水
D都含有氧元素
答案解析：
单选题：酸具有共同的性质，是因为（）。A都能电离出氢离子B都能使石蕊试液变红C都能跟碱反应生成盐和水D都含有氧元素
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