Which is a central idea of the passage? A Many areas of the world suffer from extended periods of drought. B Most water goes through a complex cleaning process before it is safe to drink. C Desalinization

Which is a central idea of the passage? A Many areas of the world suffer from extended periods of drought. B Most water goes through a complex cleaning process before it is safe to drink. C Desalinization plants remove salt from ocean water to make it safe for drinking. D Ammonium sulfate and other chemicals are added to drinking water during processing.

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