Match Column I with Column II and select the correct option. Column I (A) Primary treatment (B) Secondary treatment (C) Biogas (D) Biofertilisers Column II (i) Anaerobic sludge digester (ii) Flocs (iii) Physical removal (iv) Cyanobacteria
- A(A)-(iii), (B)-(ii), (C)-(i), (D)-(iv)
- B(A)-(ii), (B)-(iii), (C)-(i), (D)-(iv)
- C(A)-(iii), (B)-(i), (C)-(ii), (D)-(iv)
- D(A)-(iv), (B)-(ii), (C)-(i), (D)-(iii)
✓ Correct answer: A
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