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In this reaction,

2SO2(g) + O2(g) ⇌ 2SO3(g) + Heat

Adding SO2(g) will...

shift equilibrium right
shift equilibrium left
increase rate of reaction
have no effect

Adding SO2(g) to the reaction will shift the equilibrium position to the right. According to Le Chatelier’s principle, when an external stress is applied to a system at equilibrium, the system will adjust itself to reduce the stress. In this case, adding SO2(g) will increase the concentration of SO2, which will cause the system to shift the equilibrium to the right, towards the products (SO3 and Heat) to counteract the increase in concentration of the reactant SO2.