Correct answer: B. 1891
Explanation: The direct answer is B: 1891. Dr Bhimrao Ramji Ambedkar was born on 14 April 1891. To solve the question, identify that it asks for a birth year, not the year of his constitutional work or another event. The accepted historical fact is 1891. Option A, 1889, is incorrect because it is two years earlier than the documented year. Option B, 1891, is correct. Option C, 1897, is incorrect; it is a later year and is not Ambedkar’s birth year. Option D, 1907, is also incorrect and belongs to a much later period of his life. Ambedkar became a major jurist, social reformer, economist and important chairman of the Drafting Committee of the Constituent Assembly, but those achievements should not be confused with his birth date. Memory cue: Ambedkar—14 April 1891; the date is observed as Ambedkar Jayanti.