JEE Main Chemistry question

At constant temperature in one litre vessel, when the reaction, 2SO₃(g)⇌2SO₂(g)+O₂(g) is at equilibrium, the SO₂ concentration is 0.6 M, initial concentration of SO₃ is 1 M. The equilibrium constant is:

• (A)2.7
• (B)1.36
• (C)0.34
• (D)0.675Correct