Water samples with BOD values of \( 4 \mathrm{ppm} \) and 18 ppm respectively are (A) Highly pol...

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Water samples with BOD values of \( 4 \mathrm{ppm} \) and 18 ppm respectively are
(A) Highly polluted and clean
(B) Highly polluted and highly polluted
(C) Clean and highly polluted
(D) Clean and clean
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