Why Were Theories of Racial Superiority Significant in the South

Why were theories of racial superiority significant in the South?

A) They created a sense of unity that bridged class divisions among most southern whites.
B) They were primarily adhered to by the planter elite that owned slaves.
C) They played no role in encouraging white support of slavery.
D) They were created by slaves to justify their enslavement.
E) They fostered slave rebellions among slaves who believed in the inferiority of the planter class.