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In a Frost diagram for sulfur in a basic solution, the species that is most thermodynamically stable is the one that sits lowest on the diagram. This is because the species with the lowest potential is the most stable in that particular environment. It is important to note that the specific species will vary based on the pH of the solution. In a basic solution, species such as sulfite (SO3^2-) or sulfate (SO4^2-) would be likely candidates for the most stable species, as their oxidation states are relatively low and their structures are highly stable in the presence of hydroxide ions.