Explanation:

All statements are correct.
Satyagraha Movement

• In 1917, he travelled to Champaran in Bihar to inspire the peasants to struggle against the oppressive plantation system. 

• In 1917, he organised a satyagraha to support the peasants of the Kheda district of Gujarat. Affected by crop failure and a plague epidemic, the peasants of Kheda could not pay the revenue, and were demanding that revenue collection be relaxed.

• In 1918, he went to Ahmedabad to organise a satyagraha movement amongst cotton mill workers. 

• In 1919, he decided to launch a nationwide satyagraha against the proposed Rowlatt Act (1919). 

• The Act gave the government enormous powers to repress political activities and allowed detention of political prisoners without trial for two years.

• On 13th April, 1919 the infamous Jallianwalla Bagh incident took place. Seeing violence spread, Mahatma Gandhi called off the movement (18th April, 1919).

Hence option 4th is correct.