The complete disruption of the old agrarian order is the common factor because it represents the fundamental structural shift that triggered tribal uprisings across India. Traditionally, many tribal communities practiced communal land ownership, such as the 'Khuntkatti' system among the Mundas. The British colonial administration dismantled these traditional systems by introducing the concept of private property, landlordism, and the commercialization of forest resources. This structural collapse was the root cause that facilitated the specific grievances mentioned in other options, such as the heavy taxation (Option A) and the influx of 'Dikus' or outsiders like moneylenders and traders (Option C). While missionaries and taxes were significant irritants, the overarching cause was the loss of their traditional socio-economic framework and control over their ancestral lands.