Why Was Helen Hunt Jackson's Book a Century of Dishonor

Why was Helen Hunt Jackson's book A Century of Dishonor so influential?

A) It affected American attitudes toward Indians similar to how Uncle Tom's Cabin mobilized the abolitionist movement a generation earlier.
B) It provoked an intensification of efforts to exterminate the Native American population.
C) It forced the New South to acknowledge racial equality.
D) It mobilized black opinion to fight discrimination in the South.
E) It inspired the modern-day preservationist movement by focusing attention on the decline of the buffalo.