Which of the Following Processes Is Exothermic, Given the Following $\rarr$

Which of the following processes is exothermic, given the following:
N₂(g) + 2 O₂(g) $\rarr$ N₂O₄(l) $\Delta$ H° = 9.67 kJ/mol
N₂(g) + 2 O₂(g) $\rarr$ 2 NO₂(g) $\Delta$ H° = 67.70 kJ/mol

A) 2 N₂(g) + 4 O₂(g) $\rarr$ 2 N₂O₄(l)
B) ½ N₂(g) + O₂(g) $\rarr$ ½ N₂O₄(l)
C) N₂O₄(l) $\rarr$ N₂(g) + 2 O₂(g)
D) 2 N₂(g) + 4 O₂(g) $\rarr$ 2 NO₂(g) + N₂O₄(l)
E) 2 N₂(g) + 4 O₂(g) $\rarr$ 4 NO₂(g)