The Following Reaction Is at Equilibrium at a Pressure of 1

The following reaction is at equilibrium at a pressure of 1 atm,in a closed container.

Which,if any,of the following actions will decrease the concentration of CO₂ gas present at equilibrium?

A) adding N₂ gas to double the pressure
B) adding more solid NaOH
C) increasing the volume of the container
D) lowering the temperature
E) None of these choices is correct.