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The correct answer is option (a): Bulgaria and Romania. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2007, GS Paper 1, as Question 31. It falls under Current Affairs > International Organisations & Groupings.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 69 questions from International Organisations & Groupings (under Current Affairs) across multiple years. Visit the topic page to see the full list and year-wise trends.