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The correct answer is option (d): None. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2023, GS Paper 1, as Question 66. It falls under Environment & Ecology > Pollution & Waste Management.
This question is rated "moderate". It requires sound conceptual understanding of the topic.
UPSC has asked 37 questions from Pollution & Waste Management (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.