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【单选题】
维生素C（C 6 H 8 O 6 ，简称维C）主要存在于蔬菜水果中，它能促进人体生长发育、增强体质，近来研究表明维C还有抗癌作用．下列关于维生素C的说法中错误的是（ ）A.
维C的相对分子质量为176
B.
维C中氢元素的质量分数为4.5%
C.
维C中C、H、O三釉元素的质量比为9：1：12
D.
维生素C由6个碳原子、8个氢原子和6个氧原子组成
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