The correct answer is C. They live in poverty.
Step-by-step explanation
According to the fragment of the question in which the author describes the degrading treatment of which he has been a victim together with his family by different groups, including the police, saying that "Perhaps it is easy for those who have never felt the stinging darts of segregation to say, "Wait." But when you have seen vicious mobs lynch your mothers and fathers at will and drown your sisters and brothers at whim. "Further on, the author refers to the economic conditions in which Afro people live by saying" when you see the vast majority of your twenty million Negro brothers smothering in an airtight cage of poverty in the midst of an affluent society ", in this fragment the author highlights that their condition is one of poverty. Therefore, it can be affirmed that the social conditions of African Americans According to King they are poverty as he puts it literally, so the correct answer is C. They live in poverty.