Explanation: বাংলাদেশ সশস্ত্র বাহিনী গঠিত হয় ২১ নভেম্বর। Correct Answer: Option A. Option A is correct as November 21 is celebrated as Armed Forces Day in Bangladesh. Other options (B, C, D) represent incorrect dates. Note: Armed Forces Day commemorates the establishment and contributions of the Bangladesh Armed Forces.
