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Which of the following combination reactions contains at least one compound in its reactants?

$\begin{array}{1 1} (a)\;CaO(a)+H_2O(l) \longrightarrow Ca(OH)_2 (aq) \\ (b)\;2Fe(s)+O_2(g) \to 2FeO(s) \\ (c)\;4Fe(s) +3O_2(g) \to 2Fe_2O_3(s)\\ (d)\;4K(s)+O_2(g) \to 2K_2O(s) \end{array} $

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