Gold Is Produced Electrochemically from an Aqueous Solution of Au(CN)₂^-

Gold is produced electrochemically from an aqueous solution of Au(CN) ₂^- containing an excess of CN^-. Gold metal and oxygen gas are produced at the electrodes. How many moles of O₂ will be produced during the production of 1.00 mol of gold?

A) 4.00 mol
B) 3.56 mol
C) 0.50 mol
D) 1.00 mol
E) 0.25 mol