The correct answer is: d) All of the above.
Archaeological evidence suggests that the earliest inhabitants of Arunachal Pradesh likely practiced hunting and gathering, pastoralism, and shifting cultivation (Jhum).
Hunting and gathering is a subsistence strategy in which people obtain food by hunting animals and gathering wild plants. It is a relatively low-impact way of life that requires relatively little technology.
Pastoralism is a subsistence strategy in which people raise livestock. It is a more intensive way of life than hunting and gathering, as it requires people to manage their herds and protect them from predators.
Shifting cultivation (Jhum) is a form of agriculture in which land is cleared for cultivation by burning and then left fallow for a period of time to allow the land to regenerate. It is a low-input, low-output form of agriculture that is well-suited to the hilly terrain of Arunachal Pradesh.
The earliest inhabitants of Arunachal Pradesh likely practiced all of these subsistence strategies, depending on the availability of resources in their environment.