Which one of the following reactions represents a calcination reaction ?

The reaction represents a calcination reaction is,

${\mathrm{CuCO}}_3\cdot \mathrm{Cu}(\mathrm{OH}{)}_2⟶\mathrm{CuO}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$

Because it is most frequently used to manufacture cement by converting calcium carbonate (limestone) to calcium oxide (lime) and carbon dioxide, the term "calcination" comes from the Latin calcinate, which means "to burn lime."

Hence, option C is correct.