The Equilibrium Constant K_P at 427°C for the Reaction N₂(g)

The equilibrium constant K_P at 427°C for the reaction N₂(g) + 3H₂(g) 2NH₃(g) is 9.4 ×10^-5.What is ΔG° for the reaction under these conditions? (R = 8.314 J/K • mol)

A) -33 kJ/mol
B) -54 kJ/mol
C) 54 kJ/mol
D) 33 kJ/mol
E) 1.3 J/mol