How many statements are correct from the following: A. Biochemical Oxygen Demand (BOD) in river ...

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How many statements are correct from the following:
A. Biochemical Oxygen Demand (BOD) in river water gives a measure of Salmonella in the water.
B. Planktonic populations in the eutrophic lake declined initially thereby greatly reducing photosynthesis.
C. Percentage of the two (out of 4) greenhouse gases is: CFCs \( -14 \% \), Methane \( 20 \% \).
D. Treatment of waste water is done by the heterotrophic microbes naturally present in the sewage.
E. A fine powder of recycled modified plastic is called polyblend.
(1) Two
(2) Three
(3) Four
(4) All of the above
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