Correct Answer: (b) Singhbhum
Note: Kols are the inhabitants of Chhotanagpur. This area covered Ranchi, Singhbhum, Hazaribagh, Palamu & Manbhum. With the application of new land laws, outsiders like Hindu, Sikh, Muslim farmers, money lenders, etc. started coming into these tribals' area in 1831. This led to massive exploitation of tribes. In 1831, under the leadership of Buddho Bhagat, Kol rebels revolted and killed about a thousand outsiders, but only after large-scale military operations, order could be restored.