Which of the following reactions represents the "slaking of lime"?
- A$CaCO_3 \rightleftharpoons CaO + CO_2$
- B$CaO + CO_2 \rightarrow CaCO_3$
- C$CaO + H_2O \rightarrow Ca(OH)_2$
- D$CaO + SiO_2 \rightarrow CaSiO_3$
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