She presents her strongest argument at the end of the passage in order to leave the reader with a vivid image of her mistreatment. Option A is correct.
Zitkala-Ša was a Yankton Dakota Sioux writer, editor, translator, musician, educator, and political activist.
She was co-founder of the National Council of American Indians in 1926, which was founded seeking to lobby for Native people’s right to United States citizenship and other civil rights they had long been denied. Zitkala-Ša became the council’s president until she died in 1938.