Which of the following debunks the Lost Cause myth that the South seceded because of state's rights and not to protect slavery?

A. The films "Birth of a Nation" and "Gone with the Wind" are so powerful that they persuade people to believe that the war was over slavery.
B. Lincoln's Declaration of War, in which he clearly blamed the South's desire to keep slaves as a cause of the war.
C. President Woodrow Wilson, president of the U.S. during WWI and former president of Princeton, wrote about the central role that slavery played.
D. The Declarations of Secession by the Southern States, which explained that slavery was central to why they were leaving the United States.