Complete the following equation: $CaCO_3 \cdot MgCO_{3(s)} \xrightarrow{\Delta }$
- A$CaO + MgO + 2CO_2$
- B$CaCO_3 + MgO + CO_2$
- C$CaO + MgCO_3 + CO_2$
- D$Ca + Mg + 2CO_2 + 2O_2$
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