The Equilibrium Constant,K_p,for the Reaction

Multiple Choice

The equilibrium constant,K_p,for the reaction
H₂(g) + I₂(g)
2HI(g)
Is 55.2 at 425°C.A rigid cylinder at that temperature contains 0.127 atm of hydrogen,0.134 atm of iodine,and 1.055 atm of hydrogen iodide.Is the system at equilibrium?

A) Yes.
B) No,the forward reaction must proceed to establish equilibrium.
C) No,the reverse reaction must proceed to establish equilibrium.
D) The volume of the container must be known before deciding.
E) The starting concentrations of all substances must be known before deciding.