Answer:D
Explanation:the information in the passage didn’t talk about a or b nor is that a thing in the constitution now so those are completely false leaving you with either c or d now c is talking about a single house of Congress we still only have 2 houses in Congress however the question is asking different then info in the passage and everything else was already mentioned in the passage so I would say d is your answer because the passage never talked about ending slavery or gradually ending it at that