Which Is True of the Wilmot Proviso

Which is true of the Wilmot Proviso?

A) Its passage into law nullified the Missouri Compromise.
B) Democrats opposed it and Whigs supported it.
C) Opponents of the measure organized the Free Soil Party.
D) It was declared illegal by the Supreme Court's decision in the Dred Scott case.
E) Response to the measure was determined by geography, with the North supporting it and the South opposing it.