What was the significance of the decision of the U.S. Supreme Court in Dred Scott v. Sandford? (M)

A. It supported the right of each state to permit or prohibit slavery.
B. Its support of slavery and denial of citizenship to African Americans increased sectional tensions.
C. It peacefully resolved the question of whether slavery could be extended into western territories.
D. It was applauded by abolitionists who welcomed its attack on the institution of slavery in Southern states."