Drawing (1)shows a System in Which an Equilibrium Exists Between

Multiple Choice

Drawing (1) shows a system in which an equilibrium exists between dissolved and undissolved gas particles at P = 1 atm.According to Henry's law,if the pressure is decreased to 0.5 atm and equilibrium is restored,which drawing (2) -(5) best represents the equilibrium at 0.5 atm?

A) drawing (2)
B) drawing (3)
C) drawing (4)
D) drawing (5)