Which of the following techniques is environment friendly and cost effective? Options: A . &nbspPhysical B . &nbspChemical C . &nbspBiological D . &nbspCombination of physical and chemical

Which of the following techniques is environment friendly and cost effective?

Question

Which of the following techniques is environment friendly and cost effective?

Options:

A . Physical

B . Chemical

C . Biological

D . Combination of physical and chemical

Answer: Option C
Answer: (c).Biological

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