Change to equilibrium system....can you help me with chemistry?

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Thanks for helping:]
1-4
Match the change to the equilibrium system below with the letter of the appropriate response. Each letter can be used once, more than once, or not at all.
2 SO2(g) + O2(g) = 2 SO3(g)

1.
O2 is added to the reaction

2.
SO3 is removed from the reaction

3.
SO3 is added to the reaction

4.
The pressure is increased



a) The equilibrium shifts to the right
b) The equilibrium shifts to the left
c) There is no charge in the equilibrium position


THANKS SO MUCH FOR HELPING ME:]
 
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