JEE Main Chemistry question

Which equilibrium in gaseous phase would be unaffected by an increase in pressure?

• (A)N₂O₄⇌2NO₂
• (B)N₂+O₂⇌2NOCorrect
• (C)N₂+3H₂⇌2NH₃
• (D)CO+½O₂⇌CO₂