For Which of the Following Reactions Is D H -

For which of the following reactions is D H - D E > 0?

A) NaCl (aq) + AgNO₃ (aq) → AgCl (s) + NaNO₃ (aq)
B) H₂ (g) + Cl₂ (g) → 2 HCl (g)
C) 2 N₂ (g) + O₂ (g) → 2 N₂O (g)
D) NH₄NO₃ (s) → N₂O (g) + 2 H₂O (g)
E) none of these