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在①Cu、Mg、C、Hg ②CO₂、CuO、P₂O₅、H₂O ③HCl、H₂SO₄、HNO₃、Na₂SO₄三组物质中，各有一种物质在分类上与组内其他物质不同，这三种物质分别是

A. Cu、P₂O₅、H₂SO₄ B. Hg、CO₂、HCl C. C、CuO、Na₂SO₄ D. Mg、H₂O、HNO₃