Given N₂ (G)+ 3 H₂ (G)⇌ 2 NH₃ (G),which Scenario

Given N₂ (g) + 3 H₂ (g) ⇌ 2 NH₃ (g) ,which scenario will allow you to eventually reach an equilibrium mixture involving these chemicals?

A) Place only N₂ into a sealed vessel.
B) Place only H₂ into a sealed vessel.
C) Place only NH₃ into a sealed vessel.
D) All of the above scenarios.
E) none of the above