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The correct answer is option (b): 3 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2017, GS Paper 1, as Question 72. It falls under Indian Economy > Agriculture & Rural Development.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 60 questions from Agriculture & Rural Development (under Indian Economy) across multiple years. Visit the topic page to see the full list and year-wise trends.