Which government agency was set up to reduce the number of land claims made by native americans

The Bureau of Indian Affairs was set up to reduce the number of land claims made by Native Americans. The agency's mission is to: " enhance the quality of life, to promote economic opportunity, and to carry out the responsibility to protect and improve the trust assets of American Indians, Indian tribes, and Alaska Natives."" 

C. the delegated powers

Ithink its c) the conditions in the factory have never been questioned by the employee.