The correct answer is C) Indian boarding schools.
The motto “kill the Indian, but save the man” played an important role in the western expansion in the case of Indian boarding schools.
This term was coined by military officer Richard Henry Pratt, who founded the Carlisle Indian Industrial School in Pennsylvania. When he said “kill the Indian but save the man,” he meant that the Native Indian should be left behind to bring about the civil man through education. He invested part of his life in the education of Native American Indians.