Why Was Uncle Tom's Cabin Historically Significant

Why was Uncle Tom's Cabin historically significant?

A) It was an anti-slavery novel that fueled the abolitionist movement.
B) It was a propaganda pamphlet about a man who lived alone in the woods in a cabin he built himself, arguing for a "return to nature."
C) It was an anti-war treatise that argued for secession.
D) It was a pro-slavery pamphlet that encouraged the popular sovereignty movement.