Aluminum Forms a Layer of Aluminum Oxide When Exposed to Air

Multiple Choice

Aluminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion. 4Al(s) + 3O₂(g) $\rarr$ 2Al₂O₃(s)
Calculate $\Delta$ G° for this reaction, given that $\Delta$ G°_f of aluminum oxide is -1576.4 kJ/mol.

A) -3152.8 kJ/mol
B) -1576.4 kJ/mol
C) -788.2 kJ/mol
D) 1576.4 kJ/mol
E) 3152.8 kJ/mol