If we look at late-eighteenth-century revenue records, we learn that these hill folk were known as Paharias. They lived around the Rajmahal hills, subsisting on forest produce and practising shifting cultivation. They cleared patches of forest by cutting bushes and burning the undergrowth. On these patches, enriched by the potash from the ash, the Paharias grew a variety of pulses and millets for consumption. They scratched the ground lightly with hoes, cultivated the cleared land for a few years, then left it fallow so that it could recover its fertility, and moved to a new area.

So, the correct option is [1].