Social imagination refers to the perspective that we need to conform to a certain way of thinking because it seems to be more common in the perspective of other members of the social group. This make people think a certain action as 'deviant' without even considering the negative or positive value from the action.
Polygamy is practiced in some parts of the world, such as Africa and Saudi Arabia. Monogamy is the dominant form of marital relations in the united states. Many people believe that polygamy and monogamy are deviant practices because they are not using social imagination.
I believe the answer is C because the court ruled that he was not a free man because 1. He was a slave and the court believed that if you were black, then you were not a n American Citizen and 2. He was the property of his own. Sorry, I could be wrong.