The most probable reason for the qualities in the presumption two maps is the collapse of the Soviet Union.
How the Soviet Union Collapse?
The conclusion of the Gorbachev appropriate multi-party selections or the elections and found a presidential system for the Soviet Union.
This presidential system impelled off a long process of group action that eventually modified Communist power and modified to the Soviet Union's ending.
The dissolution of the Soviet Union is the most likely cause of the changes between the given two representations, and the Russia Soviet Federal socialistic republic converted in the Russia only, in the year 1997.
Therefore, option A is correct.
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