The plains indians embraced the ghost dance movement because they were? a. trying to unite all american indians b. rallying against life on reservations c. lookingbfor a reservation to call home d. creating a new buffalo hunting ritual

Option B i.e rallying against the life on reservations is the correct answer.

Ghost Dance a spiritual and political movement  of plains Indians was the manifestation of anger and hope against the oppressive policies of the US government. Their lands were confiscated and they were subjugated and imprisoned in reservations where their condition was miserable and desperate. The movement found its origin in Paute Indian named Wovoka, who announced that he was the messiah coming to earth to prepare the Indians for their salvation. He announced the people to dance for days along with some rituals which he claimed to bring the renewal of native society and decline in the influence of whites.  

there is no chart here so no one can answer this.