What Was the Annuity System Involving the U

What was the annuity system involving the U.S. government and certain Indian tribes?

A) a system under which the Indians ceded land to the United States annually
B) a system under which the federal government gave annual monetary grants to Indians
C) a system that placed Indians on reservations west of the Mississippi River
D) a system that allowed a percentage of Indians each year to attend American schools
E) a system where the states paid each local tribe an annual fee for their land