Which Group or Groups Decimated the Buffalo Herds on the Great

Multiple Choice

Which group or groups decimated the buffalo herds on the Great Plains in the late nineteenth century?

A) Native Americans who regularly slaughtered the animals as part of their rituals
B) Railroads and irresponsible hide hunters
C) The U.S.army,which killed them to feed the troops
D) Chinese and Irish work gangs who were desperate for food