Why Do Most Ethnic National Conflicts in the Global South

Why do most ethnic national conflicts in the Global South have colonial roots?

A) Imperial powers drew borders with little regard for the national identities of indigenous people.
B) European countries instilled in their colonies their strong values of xenophobia and mistrust.
C) Most people in the Global South are simply unable to get along.
D) Indigenous people fight over which colonial power they would like to have rule them.