Treating with chemicals depositing salt at the bottom
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B
Filtering the water by nets blocking the salt.
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C
Boiling the water by coil leaving behind the salt.
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D
Evaporating the water by sun leaving behind the salt.
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Solution
The correct option is D Evaporating the water by sun leaving behind the salt. Salt is produced by direct evaporation of sea-water in sun. This process is cheapest and most efficient.