Answer:
Tribalism developed in the early 1900s and encouraged the nationalist spirit of Africans throughout the world.(B.)
Committing and trying to pursue for it by taking classes
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<span>Their progress and wealth is highly dependent on the harvests, and
the price of grain. They probably have to import some industrial
products and if they had a bad year (weather, other catastrophies, poor
technology) they can't get the necessary amount of industrial products
in exchange for their surplus e. g. in grain. </span>