The correct answer to this open question is the following.
What was the significance of the Lahore Session of the Congress?
The significance of the Lahore Session of the Congress was the election of Jawaharlal Nehru as President. The session was held in December 1929 and participants decided to pass the resolution of complete independence called "Purna Swaraj."
Which event marked the beginning of the Civil Disobedience Movement?
The Dandi March of 1930 was the event that marked the beginning of the Civil Disobedience Movement in India. This movement was led by Mahatma Gandhi. Gandhi chose t break the Salt law in the city of Dand on April 5, 1930. At age 62, Mahatma Gandhi decided to walk 360 kilometers to Dandi, and during the trajectory was joined by thousands of people who decided to participate in the march to protest against the British Rule.