The Equilibrium Constant,K_c,for the Reaction 2SO₂(g)+ O₂(g) →2SO₃(g)

The equilibrium constant,K_c,for the reaction 2SO₂(g) + O₂(g) →2SO₃(g)
Is 11.7 at 1100 K.A mixture of SO₂,O₂,and SO₃,each with a concentration of 0.015 M,was introduced into a container at 1100 K.Which of the following is true?

A) SO₂(g) and O₂(g) will be formed until equilibrium is reached.
B) [SO₃] = 0.045 M at equilibrium.
C) [SO₃] = 0.015 M at equilibrium.
D) SO₃(g) will be formed until equilibrium is reached.
E) [SO₃] = [SO₂] = [O₂] at equilibrium.