Both reactions, M and N, produce carbon dioxide. M: $\text{CaCO}_3 \rightarrow \text{CO}_2$ N: $\text{CH}_4 \rightarrow \text{CO}_2$ What are the reaction types for M and N?
- AM: thermal decomposition, N: thermal decomposition
- BM: thermal decomposition, N: combustion
- CM: combustion, N: thermal decomposition
- DM: combustion, N: combustion