The term 'Paharias' is primarily associated with the people living in the Rajmahal Hills region in India. The reason for this is that the Rajmahal Hills are inhabited by various tribal communities, and these tribal people are often referred to as "Paharias." These Paharias traditionally practice shifting agriculture, where they clear and cultivate a piece of land for a few years and then move to another area when the soil fertility decreases, a practice often seen among tribal communities in hilly regions.

Option 2 correctly identifies the Paharias as dwellers settled in and around the Rajmahal Hills practicing shifting agriculture, which accurately describes this tribal group and their way of life.