Which of the following was NOT among the four main proslavery arguments of the era?
A) Blacks were biologically and mentally inferior to whites.
B) Slave labor was a necessary basis for the rise of civilization and the economic development of the South.
C) The Founding Fathers had set a precedent, in the Constitution, that could not be questioned without bringing the entire U.S. system of government and way of life into question.
D) Slavery was ordained by God.