Correct answer: A. Poorna Swaraj Day of 26 January 1930
Explanation: The direct answer is Option A: Republic Day is linked with the Poorna Swaraj Day observed on 26 January 1930. In December 1929, the Lahore session of the Indian National Congress adopted complete independence, or Poorna Swaraj, as the national goal. On 26 January 1930, people observed Independence Day and took the pledge to work for complete freedom. When the Constitution came into force on 26 January 1950, this already meaningful national date was chosen for Republic Day in memory of that earlier pledge. Option A is therefore correct. Option B, 13 April 1919, is associated with the Jallianwala Bagh massacre, a tragic event, not the reason for selecting 26 January. Option C, 8 August 1942, is associated with the Quit India resolution, which occurred on a different date and led to a different movement. Option D, the 1905 Partition of Bengal, belongs to an earlier phase of the freedom struggle and is not the specific memory behind Republic Day. Remember the date pair: 26 January 1930, Poorna Swaraj pledge; 26 January 1950, Republic Day.