-Which of These Factors Made the Upper and Lower South

-Which of these factors made the upper and lower South two distinct regions?

A) The population of the upper South was more diverse and came from different parts of Europe.
B) The lower South depended on a cash crop economy based on tobacco and grains.
C) People in the upper South had access to prestigious colleges like William and Mary while those in the lower South lacked access to such institutions.
D) The economy of the lower South was based on indentured servitude rather than slave labor.