How does the formation of the Petrograd Soviet show the social base of the February Revolution?

It was based on organised representation of workers and soldiers

The governing concept is the social base of a revolution: the groups that participate, organise and claim political representation. The Petrograd Soviet was formed through the involvement of workers and soldiers, the two forces that had become central to strikes, demonstrations and the collapse of Tsarist authority. Its structure therefore reflected urban labour and military participation rather than the interests of the royal family, foreign traders or landlords alone. Option D is correct because it directly links the institution to organised worker and soldier representation. Options A, B and C wrongly identify elite or foreign groups as the foundation of the Soviet.

This is a Class 9 History question. Chapter: Socialism in Europe and the Russian Revolution. Topic: The February Revolution in Petrograd.