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【单选题】
下列各种说法中正确的是A.
乙烯和甲苯都能使酸性高锰酸钾溶液褪色
B.
凡是能起银镜反应的物质一定是醛
C.
在酯化反应中，羧酸脱去羧基中的氢原子，醇脱去羟基生成水和酯
D.
苯酚有弱酸性，俗称石炭酸，因此它是一种羧酸
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