$\Delta H_1^\circ$ represents the standard enthalpy of formation of methane. $\Delta H_2^\circ$ represents the standard enthalpy of combustion of carbon. $\Delta H_3^\circ$ represents the standard enthalpy of combustion of hydrogen. $\text{CH}_4(g) + 2\text{O}_2(g) \xrightarrow{\Delta H_c^\circ} \text{CO}_2(g) + 2\text{H}_2\text{O}(l)$ Which expression is equal to $\Delta H_c^\circ$?
- A$\Delta H_1^\circ - \Delta H_2^\circ + \Delta H_3^\circ$
- B$\Delta H_1^\circ - 2\Delta H_3^\circ - \Delta H_2^\circ$
- C$\Delta H_2^\circ - \Delta H_3^\circ + \Delta H_1^\circ$
- D$\Delta H_2^\circ + 2\Delta H_3^\circ - \Delta H_1^\circ$