whch was an important part of the northwest ordinance?

Ait required that townships set aside land for public schools.

Bit banned non-Christian religions from all new states.

Cit allowed the ownership of slaves in all new territories.

Dit ceded the Ohio Valley to France and its Indian allies.

Please only answer if you are above 80% sure... I have been working on this for 30 minutes but cannot figure it out! Please, please, please help me out.