Suggest a condition under which magnesium could reduce alumina.

Explanation

To suggest a condition under which magnesium could reduce alumina, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The reduction of alumina (Al₂O₃) by magnesium (Mg) can be represented by the following reaction:
\[
\text{Al}_2\text{O}_3 + 3\text{Mg} \rightarrow 2\text{Al} + 3\text{MgO}
...