The correct answer to the question is boiling
Boiling is one major way we can use to obtain a dissolved solute from a solution. It involves boiling the solution to dryness so that liquid portion is evaporated leaving behind the solid.
Fractional freezing is a process used to separate substance with different melting point.
Filtration is a technique used in separating insoluble substances from a liquid.
Sorting is simply a process of arranging substance in a well mannered way. For example arranging element based on their similarities.
From the discussion above, we can conclude that boiling can be used to obtain salt from salt water solution.
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