There are tons of antonyms for credible out there, but really good ones include deceptive, dishonest, undependable, unreasonable, etc... 
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Answer:
they are :-
1. European destroyed all the system in large area of Africa when they develop the trade in enslaved African.
2. Local system were badly affected and overwhelmed by the demand of new trade in enslaved African, a trade imposed by tbe better developed guns and ship of the Europeans.
3. The European bought new disease to west Africa, for example smallpox and tuberculosis had a devastating impact on the population of West Africa.
Explanation:
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The most likely reason Persia gave economic control to Russia and Britain was because they were torn from a revolution and needed the injection of cash and credit that this transfer would bring. 
        
             
        
        
        
I thins is B because of the Cuban came to saint area