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Column I
Column II
I. Methanogens
A. Microbial biocontrol agent
P
II. Organic wastes
B. Penicillin
W
III. Bacillus thuringiensis
C. Biochemical oxygen demand
IV. Penicillium notatum
D. Methanobacterium
Which of the combinations is correct?
\( \begin{array}{lllll} & \text { I } & \text { II } & \text { III } & \text { IV } \\ \text { (a) } & \mathrm{B} & \mathrm{A} & \mathrm{D} & \mathrm{C} \\ \text { (b) } & \mathrm{C} & \mathrm{D} & \mathrm{A} & \mathrm{B} \\ \text { (c) } & \mathrm{D} & \mathrm{C} & \mathrm{A} & \mathrm{B} \\ \text { (d) } & \mathrm{D} & \mathrm{B} & \mathrm{A} & \mathrm{C}\end{array} \)
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