The correct answer b) social contract. the other answers are wrong, for example: the divine right of king would mean that the king has a right to rule and does need an agreement from the people and natural rights are rights that all people have but the agreement, is not a right, but an agreement, or in other words: contract.
Well, All I know is that In the south they were mostly plantations, thus the need for slaves. And in the north, it was mostly city, with a few SMALL farms
