Which of the Equations Listed Below Corresponds to the Standard

Which of the equations listed below corresponds to the standard molar enthalpy of formation D H ° _f for NH₄NO₃?

A) NH₄⁺ (aq) + NO₃ ^- (aq) → NH₄NO₃ (s)
B) NH₃ (g) + HNO₃ (g) → NH₄NO₃ (s)
C) N₂ (g) + 2 H₂ (g) + ³/₂ O₂ (g) → NH₄NO₃ (s)
D) 2 N₂ (g) + 4 H₂ (g) + 3 O₂ (g) → 2 NH₄NO₃ (s)
E) 2 N (g) + 4 H (g) + 3 O (g) → NH₄NO₃ (s)