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Match the following columns.
\begin{tabular}{lll}
\hline & \multicolumn{1}{c}{ Column I } & \multicolumn{1}{c}{ Column II } \\
\hline A. High nitrate and phosphate & \\
\hline B. & DDT & 2. High BOD \\
\hline C. & Phosphates & 3. Biomagnification \\
\hline D. & Water hyacinth & 4. Eutrophication \\
\hline
\end{tabular}
Codes
\( \begin{array}{lclll} & \text { A } & \text { B } & \text { C } & \text { D } \\ \text { (a) } & 1 & 2 & 3 & 4 \\ \text { (b) } & 2 & 3 & 4 & 1 \\ \text { (c) } & 3 & 4 & 1 & 2 \\ \text { (d) } & 2 & 1 & 4 & 3\end{array} \)
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