The Thermochemical Equation That Is Associated With $\Delta$ H°_f, the Standard Enthalpy of Formation for Urea, CO(NH₂)₂(s), Is

The thermochemical equation that is associated with $\Delta$ H°_f, the standard enthalpy of formation for urea, CO(NH₂) ₂(s) , is

A) CO(g) + 2 NH₃(g) $\rarr$ CO(NH₂) ₂(s) + H₂(g) .
B) CO(g) + 2 H₂(g) + N₂(g) $\rarr$ CO(NH₂) ₂(s) .
C) C(s) + O(g) + N₂(g) + 2 H₂(g) $\rarr$ CO(NH₂) ₂(s) .
D) C(s) + ½ O₂(g) + N₂(g) + 2 H₂(g) $\rarr$ CO(NH₂) ₂(s) .
E) C(s) + ½ O₂(g) + 2 NH₂(g) $\rarr$ CO(NH₂) ₂(s) .