Regarding Slavery, the Northwest Ordinance of 1787

Regarding slavery, the Northwest Ordinance of 1787:

A) allowed for new territorial governments to ban or permit the institution as they saw fit.
B) allowed the importation of slaves into the Old Northwest for at least another twenty years.
C) banned slavery in the area north of the Ohio River and east of the Mississippi River.
D) made no difference, because the U.S. Supreme Court declared it unconstitutional the following year.
E) gave slaveholders the right to recover slaves who escaped into the area north of the Ohio River.