Correct Answer: (b) Ranchi
Solution:The working region of Birsa Munda was expanded from Ranchi to Bhagalpur. The major objectives of Birsa were to introduce social reforms in tribal areas and keep away from British Rule. Birsa criticized the traditional tribal customs, beliefs, and practices. He encouraged the Munda tribes to fight against superstitions, renounce animal sacrifices, stop taking intoxicants, wear the sacred thread, and give up traditional tribal worship in the sacred grove. The British crushed this great movement.