The correct answer is: A. Mahatma Gandhi.
Mahatma Gandhi was the national leader of the Champaran Movement. The Champaran Movement was a peasant uprising in the Champaran district of Bihar, India, led by Mahatma Gandhi in 1917. The movement was against the British indigo plantation system, which was exploitative and oppressive to the peasants. Gandhi’s nonviolent methods of protest were successful in getting the British to abolish the indigo plantation system. The Champaran Movement was a turning point in Gandhi’s career and helped to establish him as a national leader.
Option B, Birsa Munda, was a tribal leader who led the Munda uprising against the British in 1899. Option C, Baba Ramchandra, was a social reformer who worked for the upliftment of the downtrodden in the early 20th century. Option D, Ram Singh, was a freedom fighter who fought against the British in the Indian Rebellion of 1857.