AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Answer: (B)
After the failure of the 1848 liberal revolutions, conservative leaders like Bismarck harnessed nationalist sentiment to strengthen state power, and later European powers used it to justify imperial expansion.
The textbook explicitly states: "After 1848, nationalism in Europe moved away from its association with democracy and revolution. Nationalist sentiments were often mobilised by conservatives for promoting state power." Bismarck's unification of Germany through military force (not elected parliaments) is the key example. The "Nationalism and Imperialism" section further confirms nationalism became "a narrow creed" used by major powers to further imperialist aims. Option A is false (secret societies didn't overthrow monarchies); C is partially true but not the best explanation; D is incorrect as nationalist tensions continued within Europe (e.g., Balkans).
Source: Chapter 1, Section 4 (The Making of Germany and Italy) and Section 6 (Nationalism and Imperialism)