Methane combustion is a redox reaction. $\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$ Which of the following statements about this reaction is correct?
- AOnly carbon is oxidised.
- BOnly carbon is reduced.
- COnly oxygen is oxidised.
- DOnly oxygen is reduced.