Why did the institution of slavery develop in africa?

a. africa had too many people.
b. slaves were valued as goods to be sold and traded.
c. european traders introduced slavery to west africa.
d. africa had an excess of land and a shortage of labor.

i'm not sure if it's b or c. !

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after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bilateral multipolar bipolar unilateral

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bipolar.  

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true false

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true.

explanation: