The correct answer is C. It allowed ownership of slaves in all new territories
The Northwest Ordinance, enacted July 13, 1787, was an organic act of the Congress of the Confederation of the United States. It created the northwest territory, the first organized territory of the United States, from lands beyond the Appalachian Mountains, between British North America and the Great Lakes to the north and the Ohio River to the south. It basically allowed ownership of slaves in all new territories because they didn´t want slavery to exist in this territory.