Which group represented the power of 'Plough' in the Rajmahal hills?

The correct answer is Option 4: Santhals

The Pahariyas and Santhals settled around the Rajmahal hills in Bengal around the later half of the eighteenth century. Around the 1770s, the lower hills (of Rajmahal hills) were taken over by Santhal settlers, the Paharias receded deeper into the Rajmahal hills. If Paharia life was symbolised by the hoe, which they used for shifting cultivation, the settlers (SANTHALS) came to represent the power of the plough. The battle between the hoe and the plough was a long one.