Which of these methods is/are used to control water pollution?

1.	Which of these methods is/are used to control water pollution?
A.	Only (i) and (ii)
B.	Only (ii) and (iii)
C.	Only (i), (ii), (iii)
D.	(i), (ii) and (iii)
Answer» E.

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Which of these methods is/are used to control water pollution?

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