I believe it's A. the others one's seem less likely.
B) Belgian Congo
Don't believe me look it up
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Slave trade left Africa underdeveloped, demographically unbalanced, and vulnerable to future European colonization.
Answer:
Edict of Milan, proclamation that permanently established religious toleration for Christianity within the Roman Empire. ... It was the outcome of a political agreement concluded in Mediolanum (modern Milan) between the Roman emperors Constantine I and Licinius in February 313.