In the Case of Leonard Peltier, Three People Were Killed

In the case of Leonard Peltier, three people were killed on the Pine Ridge Indian Reservation. Two were FBI agents and one was a Native American member of the American Indian Movement (AIM) . What was the result of the investigation into the death of the AIM member?

A) The two dead FBI agents had shot and killed the AIM member.
B) Nothing-there was no investigation into his death.
C) Two other Native Americans were convicted of that killing.
D) Another FBI agent legally shot and killed the AIM member in self-defense.