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B is the first sentence of the paragraph, telling us about a way in which waste water could be put to productive use. C follows B, cautioning that waste water should be used for agricultural purposes only after treatment. D follows C, expressing concern that the caution given in C is rarely followed. E follows, placing the blame on agricultural and water policies. A ends the passage by listing out the hazardous materials found in waste water. Option C is the right answer.
राजस्थान राज्य अभिलेखागार कहाँ स्थित है -
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