Perestroika was Gorbachev's plan for economic restructuring. Under perestroika, the Soviet Union began to move toward a hybrid communist-capitalist system, much like modern China. The policy-making committee of the Communist Party, called the Politburo, would still control the direction of the economy.
the answer is:
c. islam and christianity
islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.
i think the reason that they immagrated was to find freedom of religion