In which Congress Session, was the demand for 'Purna Swaraj' adopted?

Correct option is B

The demand for Purna Swaraj (complete independence) was adopted at the Lahore Session in 1929.

Explanation:
● Under the leadership of Jawaharlal Nehru, the Congress declared complete independence as its goal during this session.
● The Purna Swaraj resolution was officially proclaimed on 26th January 1930, celebrated later as Republic Day.

Information Booster:
● The session marked a shift from dominion status to a demand for complete independence.
● The Civil Disobedience Movement began shortly after, in 1930, with the Salt Satyagraha.

Additional Information:

• (A) Surat Session: Known for the split between the Moderates and Extremists in 1907.
  
• (D) Karachi Session: Focused on fundamental rights and economic policies in 1931.