Consider the Reaction
4NH₃(g)+ 3O₂(g) $f$ 2N₂(g)+ 6H₂O(g),
K = 10⁸⁰ at a Certain Temperature

Consider the reaction
4NH₃(g) + 3O₂(g) $f$
2N₂(g) + 6H₂O(g) ,
K = 10⁸⁰ at a certain temperature.
Initially,All reactants and products have concentrations equal to 12 M.
At equilibrium,The approximate concentration of oxygen is

A) 6 M.
B) 0 M.
C) 3 M.
D) 12 M.
E) 18 M.