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The correct answer is option (b): B.
This question was asked in UPSC CSE Prelims 1996, GS Paper 1, as Question 143. It falls under Science & Technology > Logical Reasoning & Puzzles.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 70 questions from Logical Reasoning & Puzzles (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.