The correct answer is: B. Bhukhan Singh
Bhukhan Singh was a Kharwar tribal leader who led the Kharwar Movement in the early 20th century. The movement was a protest against the exploitation of the Kharwar people by the British colonial government. Bhukhan Singh and his followers demanded better rights and treatment for the Kharwar people. The movement was successful in achieving some of its demands, and it helped to raise awareness of the plight of the Kharwar people.
A. Bhagirath Manjhi was a poor laborer from the Santhal tribe who single-handedly carved a 131-foot-long (40 m) tunnel through a mountain in order to shorten the journey between his village and the nearest town. He was not a leader of any movement.
C. Dukhan Singh was a Kharwar tribal leader who was involved in the Kharwar Movement. However, he was not the pioneer of the movement.
D. Kanhu Murmu was a Munda tribal leader who was involved in the Santhal Rebellion of 1855. He was not a leader of the Kharwar Movement.