Which idea did the Russian Revolution strengthen for oppressed classes?

Correct answer: Social change is possible through organisation

The Russian Revolution made the idea of collective action powerful among oppressed people. It suggested that poor workers and peasants were not helpless and could influence political and social life when they united around common demands. Organisation meant forming groups, parties, unions, and movements that could express people’s interests and press for change. This idea encouraged many later struggles for equality and rights.

Option D follows because it directly connects organisation with social change. The other choices defend birth-based power, political passivity of the poor, or colonialism, which are opposite to the revolutionary message. The revolution did not prove that every organised movement would automatically succeed, but it strongly demonstrated that disciplined collective action could challenge an old social and political order. Therefore, the supplied answer is consistent.