Final answer:
The centralized power of the Soviet Union and contemporary Russian Federation can be compared in terms of territorial control. Russia is an ethnically diverse region with many subnational units, option no 2.
Step-by-step explanation:
The centralized power of the Soviet Union and the contemporary Russian Federation can be compared in terms of territorial control. During the Soviet Union era, the central government exerted significant control over the vast territory that spanned from Eastern Europe to the Pacific.
Currently, the Russian Federation is an ethnically diverse region with many subnational units. Autonomous regions in Russia serve as a strategy to govern such a large area from a single centralized location, by allowing local people some measure of political autonomy.
Based on this information, the statement that best aligns with the comparison between the Soviet Union and the contemporary Russian Federation is: Russia is an ethnically diverse region with many subnational units.