Which equation illustrates the reduction of an iron compound?
- A$4\text{Fe} + 3\text{O}_2 \rightarrow 2\text{Fe}_2\text{O}_3$
- B$\text{Fe} + 2\text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2$
- C$4\text{FeO} + \text{O}_2 \rightarrow 2\text{Fe}_2\text{O}_3$
- D$\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$