The only Empire to include Saharan salt mine was - Ghana (West Africa)
Psycho-Physics as a discipline within the psychology began with the work Elemente de Psychophysics ( Elements Of Psychophysics ), written by German philosopher and physicist Gustav theodor Fechner. He actually aimed at developing a method that relates mind ( psych ) to matter ( physics ). So Psychophysics is the scientific study of the relation between stimulus and sensation.
I think that the answer is D. Lynching and Ku Klux Klan
Answer:
they domesticated animals and created a complex structure with false systems.