A few minor questions I'm trying to figure out.

All the following Native Americans were Sioux leaders except-
(A) Geronimo
(B) Red Cloud
(C) Crazy Horse
(D) Sitting Bull.

The last major conflict between the U.S army and Native Americans took place at-

(A) the Little Bighorn
(B) the Rosebud
(C) Sand Creek
(D) Wounded Knee

Farmers on the Great Plains were aided by
(A) Dry farming
(B) the Windmill
(C) Barbed wire
(D) all of these

In 1864, Colorado militia led by Colonel John Chivington killed over 100 Native American me, women and children in a Cheynne village at-

(A) the Little Bighorn
(B) the Rosebud
(C) Sand Creek
(D) Wounded Knee.