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The main object of sewage disposal is

[A].	to dispose off properly human excreta to a safe place before its creates unhealthy conditions in the locality	[B].	to dispose off waste water from an area so that it may not become breeding place for mosquitoes
[C].	to dispose off the sewage after giving it treatment so that the receiving land may not get polluted	[D].	all of the above

Answer: Option D