The outcome of the Franco-Prussian War was that France was defeated, and Germany was unified. Option B is correct.
Franco-German War, also known as Franco-Prussian War constituted a war in which a coalition of German states led by Prussia defeated France. The war resulted in the end of French hegemony in continental Europe and marked the creation of a unified Germany.
The immediate cause of the Franco-German War was the candidacy of Prince Leopold of Hohenzollern-Sigmaringen.