For $2\mathrm{Zn}(\mathrm{s})+\mathrm{O}{}_2\to 2\mathrm{ZnO}(\mathrm{s})$: $\Delta H^{\circ }=-700\mathrm{kJ}$, $\Delta S^{\circ }=-200\mathrm{J}{\mathrm{K}}^{-1}$. For $2\mathrm{C}(\mathrm{s})+\mathrm{O}{}_2\to 2\mathrm{CO}(\mathrm{g})$: $\Delta H^{\circ }=-220\mathrm{kJ}$, $\Delta S^{\circ }=+180\mathrm{J}{\mathrm{K}}^{-1}$. Assume both are independent of temperature and ignore the vaporisation of zinc. The lowest temperature at which carbon can reduce $\mathrm{ZnO}$ to zinc with $\mathrm{CO}$ as the product is about

1. A3500 K
2. B1222 K
3. C2421 K
4. D1263 K