In the competition for resources, what were early native american groups more likely to fight over?
a. hunting ground borders
b. religious practices
c. rivalry between leaders
d. trade expansion

The correct option is A. 
Most of the quarrels and wars that were fought in the early day were because of land. Land was the most important resources them and it represented the wealth of the people. Without land people can not practiced agriculture or hunting, neither will they have a place to stay. That was why land was fought over so fiercely.