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The correct answer is option (b): 2 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2022, GS Paper 1, as Question 84. It falls under Environment & Ecology > Renewable Energy & Green Technologies.
This question is rated "moderate". It requires sound conceptual understanding of the topic.
UPSC has asked 18 questions from Renewable Energy & Green Technologies (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.