The following pictures represent solutions at various stages in the titration of a weak diprotic acid H2A with aqueous KOH.Unshaded spheres represent H atoms,black spheres represent oxygen atoms,and shaded spheres represent A2- ions.(K+,H3O+ initially present,OH- initially present and solvent water molecules have been omitted for clarity) . 
-Which picture represents the system with the lowest pH?
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