The correct answer is 1917.The Champaran satyagraha took place on 19 April 1917.Champaran is a district in the state of Bihar.Champaran satyagraha came into force because farmers were forced to grow indigo in a part of their land. This created much anger among farmers.The European planters had been forcing the peasants to grow indigo on 3/20 part of the total land (called tinkathia system).Gandhi travelled across the district to different villages, meeting farmers and taking note of their sufferings and complaints against the forced indigo cultivation.His protest led to the abolishing of the exploitative tinkathia system.The victory at Champaran established Gandhiji in Indias struggle against the British raj.This was the first Civil Disobedience Movement by Gandhi Ji in India.