In an aqueous solution, once all of the ions have attached themselves to the oppositely charged ends of the molecules of water, the compund is considered to be completely

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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