The Modoc War of the Mid-Late 19th Century Was Caused

The Modoc War of the mid-late 19th century was caused by

A) the U.S.government prohibiting the hunting of caribou.
B) the forced relocation of the Modoc into Klamath territories.
C) conflict between the Hudson's Bay Company and other fur companies.
D) the refusal of white settlers to leave their farms in northern Idaho.