Which answer best describes how the Second Empire became the Third Republic

The Second Empire gave way to the Third Republic after France lost the Franco-Prussian War to Prussia.

Louis-Napoleon Bonaparte (nephew of the more famous Napoleon) had become president of France in 1848, and tried to return to the nostalgic glory days of France as an empire by having a referendum in 1852 to name him as emperor. But the Second Empire never was as powerful as its predecessor.

The Third Republic, which commenced in 1870, lasted until France fell to German invasion in World War II (in 1940).