The correct answer is 2, 1, 3, 4.Champaran Satyagraha :The Champaran Satyagraha of 1917 was the first Satyagraha movement inspired by Gandhi and a major revolt in the Indian Independence Movement.It was a farmer's uprising that took place in the Champaran district of Bihar, India during the British colonial period.The farmers were protesting against having to grow indigo with barely any payment for it.Ahmedabad Mill Strike:The Ahmedabad Mill Strike was an episode in Modern Indian History where workers of textile mills in Ahmedabad fought for economic justice when the mill owners discontinued their plague bonuses.Mahatma Gandhi undertook his first Huger strike on 15th March 1918.Ahmedabad Mill Strike in February 1918 was one of the initial movements led by Gandhi at the beginning of the 20th century after his return from South Africa.Satyagraha SabhaIt was founded by Mahatma Gandhi in February 1919.Satyagraha Sabha was founded in protest against the Rowlatt Act.Rowlatt is also known as the Anarchical and Revolutionary Crimes Act of 1919.The Rowlatt Act empowered the British Government to suspend the right of Habeas Corpus.Jallianwala Bagh Massacre: The incident happened against the backdrop of protests against the Rowlatt Act and the subsequent arrest of Dr. Satyapal and Saifuddin Kichlew.To control the violence that emerged after the arrest of the two nationalists, restrictions were imposed on the movement of people and holding the demonstrations in Amritsar.But on the day of Baisakhi, April 13, 1919, thousands of people were unaware of the restrictions gathered at Jallianwala Bagh.General Dyer following the orders of Michael O'Dwyer (Lt. Governor of Punjab) directed the troops to surround the gathering and shoot the people without any warning.As a result, thousands of people were killed and injured.After this incident, Rabindra Nath Tagore renounced his Knighthood.Mahatma Gandhi gave up the title of Kaiser-i-Hind and withdrew the Satyagrah against Rowlatt act.Hence, Option 2 is correct.