Which river was essential to the survival of the
West African kingdoms of Ghana, Mali, and
Songhai?
(1) Thames (3) Indus
(2) Niger (4) Euphrates

Answer :

RedRicin
Just compare a river map of West Africa to a map of West African kingdoms.
You can clearly see that all of these kingdoms form around the Niger River.

More support to this: None of these other rivers are even in Africa: The Thames is in England, the Indus is in Pakistan, and the Euphrates runs through the Middle East.

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