The new African countries emerged and suffered due to border disputes of previous European boundaries during WWII.
WWII, also known as World War II arose among the global powers of the world and lasted till the year 1945.
During WWII, the African countries were able to fight for their liberty which emerged as African nationalism. It led to the end of colonization rule exercised by European countries on the African nations.
Therefore, the explanation provided in part A would be the right answer.
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