What decisive indication did the Battle of Waterloo give about the Napoleonic era?

Correct answer: Napoleon was finally defeated and his era ended

The direct answer is B: Napoleon was finally defeated and his era ended. The Battle of Waterloo was fought in 1815, near present-day Belgium. Napoleon had returned to power after escaping exile, but the British-led allied army under Wellington and the Prussian army defeated him. Step by step: Napoleon returned for the Hundred Days; European opponents united against him; Waterloo stopped his final military attempt; he abdicated and was sent into final exile; therefore his political and military dominance ended. Option A is wrong because he did not become permanent ruler of Europe. Option B is correct because Waterloo marked his final defeat and the end of the Napoleonic era. Option C is wrong because the Russian Revolution began in 1917, more than a century later. Option D is wrong because the United Nations was founded in 1945 after the Second World War. Memory cue: Waterloo equals 1815 and Napoleon's final defeat.