The given graph shows the effect of sewage discharge on some important characteristics of a rive...

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The given graph shows the effect of sewage discharge on some important characteristics of a river. Which of the following is the correct label for A , B and C ?
(A) (A) Dissolved oxygen, (B) Point of sewagedischarge,
(C) BOD
(B) (A) BOD, (B) Point of treated water discharge,
(C) Dissolved oxygen
(C) (A) Dissolved oxygen, (B) Point of treated water discharge, (C) BOD
(D) (A) BOD, (B) Point of sewage discharge, (C) Dissolved oxygen
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