The correct option is A.
Explanation
The concept of "Purna Swaraj" (Complete Independence) was a pivotal shift in the Indian National Movement, moving the political objective from "Dominion Status" to absolute sovereignty.
- Historical Context: During the Lahore Session of the Indian National Congress in December 1929, presided over by Jawaharlal Nehru, the "Purna Swaraj" resolution was formally adopted.
- Declaration of Independence: As a consequence of this resolution, the Congress Working Committee decided that January 26, 1930, would be observed as "Purna Swaraj Day" or the first Independence Day.
- Observance: On this day, the national flag was hoisted across the country, and a pledge of independence was read out, committing the people to a civil disobedience movement to achieve total freedom from British rule.
- Constitutional Significance: To honor the historical importance of this date, January 26 was later chosen as the date for the commencement of the Constitution of India in 1950, marking India's transition to a Republic.
Key Takeaway: January 26, 1930, was the first date designated as Independence Day following the Purna Swaraj resolution of the 1929 Lahore Session.