Which combination of conditions is employed in the contact process?
- Atemperature $100\,^{\circ}\text{C}$, pressure $1\,\text{atm}$, catalyst $\text{V}_2\text{O}_5$
- Btemperature $300\,^{\circ}\text{C}$, pressure $1000\,\text{atm}$, catalyst Fe
- Ctemperature $450\,^{\circ}\text{C}$, pressure $1\,\text{atm}$, catalyst Fe
- Dtemperature $450\,^{\circ}\text{C}$, pressure $1\,\text{atm}$, catalyst $\text{V}_2\text{O}_5$