Which of the Following Is the Equation Corresponding to the Formation

Which of the following is the equation corresponding to the formation reaction for nitric acid in the gas phase? ( $\Delta$ Hrxn = $\Delta$ Hproducts - $\Delta$ Hreactants; $\Delta$ Hrxn = Bond broken - Bonds made)

A) H₂ + N₂ + O₂ $\rarr$ HNO₃
B) H (g) + N(g) + 3 O (g) $\rarr$ HNO₃ (g)
C) H (g) + N(g) + O₃ (g) $\rarr$ HNO₃ (g)
D) 1/2 H₂ (g) + 1/2 N₂(g) + 3/2 O₂ (g) $\rarr$ HNO₃ (g)
E) H₂ (g) + N₂(g) + 3 O₂ (g) $\rarr$ 2 HNO₃ (g)