ജല (മലിനീകരണം തടയലും നിയന്ത്രണവും) നിയമം ഇന്ത്യയിൽ പ്രാബല്യത്തിൽ വന്ന വർഷം ഏതാണ്?
A1974
B1977
C1981
D1986
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