For the reaction CO(g)+H2O(g)⇌CO2(g)+H2(g) at a given temperature, the equilibrium amount of CO2(g) can be increased by
Adding a suitable catalyst
Adding an inert gas
Decreasing the volume of the container
Increasing the amount of CO (g)
Since Δvg=0, only increasing the amount of CO (g) will increase the equilibrium amount of CO2(g).