Final answer:
The establishment of boundaries without considering ethnic or religious factors during Imperialism in Africa led to ethnic and religious conflicts after WWII.
Step-by-step explanation:
The establishment of boundaries without considering ethnic or religious factors during Imperialism in Africa became a problem after WWII because it led to ethnic and religious conflicts (c). The European powers divided communities, disregarded ethnic boundaries, and often placed warring groups together in the same colony. The borders created by the imperialists cut through ethnic groups, leaving some groups divided between two governments. This resulted in ongoing geopolitical issues and tensions, contributing to conflicts in post-WWII countries in Africa.