(C) The chemical formulas for the given substances are:$1$. Bauxite: $Al_2O_3 \cdot 2H_2O$ (contains oxygen)$2$. Epsom salt: $MgSO_4 \cdot 7H_2O$ (con

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(C) The chemical formulas for the given substances are:$1$. Bauxite: $Al_2O_3 \cdot 2H_2O$ (contains oxygen)$2$. Epsom salt: $MgSO_4 \cdot 7H_2O$ (contains oxygen)$3$. Cryolite: $Na_3AlF_6$ (does not contain oxygen)$4$. Dolomite: $CaCO_3 \cdot MgCO_3$ (contains oxygen)Therefore,the correct option is $(C)$.