Why did the Russian Revolution have a long-term influence?

Correct answer: It offered the idea of an alternative society and state model.

The governing concept is the persistence of an alternative political model. The Russian Revolution did not merely change one government; it presented a claim that society could be reorganised around socialist principles, collective ownership and the political role of workers and peasants. Even where governments did not copy the Soviet model, parties, reformers and anti-colonial leaders debated its promises and failures. Option A is correct because this alternative vision continued to influence political choices and movements for decades. Options B, C and D are incorrect because the revolution challenged Tsarism and colonialism and stimulated, rather than ended, political mobilisation.