Who owned the property of the Iroquois clan?
Mother, father, child, or chief

It is principally the women who are responsible for the land, who farm it, and who care for it for the future generations. When the Confederacy was formed, the separate nations formed one union. So, I am guessing the mother would be the owner.

the answer wold be b) travel among nations should be regulated by an international organization

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.