2SO2(g) + O2(g) ⇌ 2SO3(g) ∆H < 0 Which change(s) will increase the quantity of SO3(g) at equilibrium — Equilibrium Chemistry Question

2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ∆H < 0
Which change(s) will increase the quantity of SO₃(g) at equilibrium?
I. increasing the temperature
II. reducing the volume of the container
III. adding He to increase the pressure