The following are the two things that white encroachment did to Indian tribes:
A. it took away their hunting grounds
B. they were forced to sell their land
White encroachment refers to the intrusion or invasion of white settlers, colonists, missionaries, and the like upon the land and communities of indigenous or other established populations, used esp. with reference to acts perpetrated by European colonists upon American Indian land and people.
The correct answers between all the choices given are the first and third choice or letters A and C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.