As the concentration of one of the (gaseous) products diminishes, the equilibrium changes to the right (to the products).
Due to its solid form, Fe3O4 won't have an impact on the equilibrium. The equilibrium is only impacted by changes in the concentration of gaseous or aqueous reactants.
Solid carbon dioxide in the form of dry ice sublimates easily to create gaseous CO2, which raises product concentration. (The reaction is endothermic, as well.
Gas molecules are present in equal amounts on both sides of the reaction. The equilibrium is therefore unaffected by variations in volume. (It does expedite responses in both directions, at least)
The reactants will be more concentrated after adding CO(g).
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