I think the answer would be the 3rd one so c. sorry if not
It has 10% of historic aviation inventions
In the summer of 1939, Soviet and Japanese armies clashed on the Manchurian-Mongolian frontier in a little-known conflict with far-reaching consequences.
Downfall of Mali Empire:Weakened by attacks and internal rewbellion. The Mali lost it's hold on the Gold and Salt trade. The Songhai empire was then able to grow in power and take previously held Mali territories. Downfall of Songhai Empire: The moroccan armies invaded songhai, which led the fall of songhai empire. Downfall of Ghana Empire:In the 11th century, when the Almoravids, a militant confederation of Muslims, began to attack the empire and even conquered it for a time. Though their grip on power did not last long, the chaos they brought to the region destabilized trade, hurting the empire's sources of income.
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