The correct answer is B. Soviets.
The first soviets were councils of workers (soviet is the Russian word for council) and were organized in 1905 after the revolution of that year. After the Russian Revolution of 1917, the Communist party led by Vladimir Lenin established the first Communist form of government known as the Union of Soviet Socialist Republics. It was based on a network of labor councils, formed by workers, peasants, and soldiers that worked in every city. These federal assembles were the fundamentals of the Soviet power. Above all of these soviets, there was the Supreme Soviet which was the central government and highest authority. Every Soviet Republic had at the same time a Supreme Soviet, that was under the rule of the Supreme Soviet of the Soviet Union.
