Iron is obtained from hematite in the blast furnace at a temperature of around $1550\,^{\circ}\text{C}$. Which equation represents the main reaction responsible for raising the temperature inside the furnace?
- A$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$
- B$\text{C} + \text{O}_2 \rightarrow \text{CO}_2$
- C$\text{CO}_2 + \text{C} \rightarrow 2\text{CO}$
- D$\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$