During the extraction of aluminium from aluminium oxide, the three reactions below occur. 1 $\text{Al}^{3+} + 3e^- \rightarrow \text{Al}$ 2 $2\text{O}^{2-} \rightarrow \text{O}_2 + 4e^-$ 3 $\text{C} + \text{O}_2 \rightarrow \text{CO}_2$ Which reactions occur at the positive electrode?
- A1 only
- B2 only
- C1 and 3
- D2 and 3