Consider the equilibrium reaction represented by the equation: 2SO_2(g) + O_2(g) ⇌ 2SO_3(g) ∆H = - 197 kJmol^-1. At equilibrium, increase in the total pressure of the system brings about

• A decrease in rate of the reaction of the system
• B decrease in temperature of the system
• C increase in temperature of SO₃
• D increase in concentration of SO₂