If the peoples of the northeastern and atlantic seaboard areas were periodically nomadic, based on information from the map, which of the following best explains why?
a. the dominance in each region by one powerful tribe led other peoples to move to unoccupied lands every few years.
b. their agricultural practices quickly exhausted the fertility of the land and forced movement.
c. their subsistence did not include fishing, and so they were less likely to be sedentary.
d. the areas were more densely populated than others

Based on the information on the map which I have attached, the following statement best explains:

b. Their agricultural practices quickly exhausted the fertility of the land and forced movement.

Explanation:

The option a is not correct as the dominance in each region by one powerful tribe led other people to move to un-occupied lands every few year. This information is not full so not explains in a best way. The option b is correct as this land has farming as a source of livelihood so the agricultural practices quickly the fertility of the land and forced movement due to traditional ways of farming. So, for the search of survival, they had to move.The option c is not correct as this statement is not fully explaining the situation.The option d is also incorrect as it is also not giving us some useful information and it is less relative here.

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.