I think the last option might be right too
The correct answer is:
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C. To appeal to the dissatisfied, multi-ethnic population of the Soviet Union.
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Gorbachev was not trying "to establish his dominance," as the other answer here had suggested. When Gorbachev came into leadership in the USSR, the Soviet economy was struggling and there were dissidents across the spectrum of the country who called out for reforms and changes.
In 1985, Mikhail Gorbachev proposed policies of perestroika (restructuring) and glasnost (openness) in the Soviet Union. Perestroika meant allowing some measure of private enterprise in the Soviet Union. Glasnost meant allowing a bit of freedom in regard to speech and publication.
Early machine guns, such as those in 1914, could fire 400-600 rounds per minute. After the war, the figure was more than doubled. The machine guns in could fire more than 1000 rounds per minute. The rounds were fed via a fabric belt or a metal strip. I hope this helps.