Endothermic reaction system at equilibrium... ? ;\

For the following endothermic reaction system at equilibrium:

2SO3(g)  2SO2(g) + O2(g)

Choose the changes that will shift the equilibrium position to the right.

(Select all that apply.)

Remove SO3(g)
Add a catalyst
Add Ne(g)
Decrease volume                         And maybe this one
Add SO2(g)
Decrease temperature
Increase temperature                    I think its this one

Could anyone confirm this, I'm thinking because of an increased temp the reaction will occur more frequently which is along the same lines on why decreasing the volume would also?