Consider the Reaction Represented by the Equation N₂(g)+ 3H₂(g)

Consider the reaction represented by the equation N₂(g) + 3H₂(g) 2NH₃(g) .What happens to the equilibrium position when an inert gas is added to this system (as represented above) at equilibrium?

A) If the container is rigid,the equilibrium position shifts.If the container is fitted with a movable piston,nothing happens to the equilibrium position.
B) If the container is rigid,nothing happens to the equilibrium position.If the container is fitted with a movable piston,the equilibrium position shifts.
C) Nothing happens to the equilibrium position no matter what the container is like.
D) The equilibrium position shifts no matter what the container is like.
E) The value of the equilibrium constant must be known to answer this question.