The statement that best explains the causes leading to the emancipation of Russia’s serfs is:
Alexander II saw serfdom as inhumane, and the military loss in the Crimean War prompted Alexander II to enact social reform, which led to the emancipation of Russia’s serfs.
This statement accurately captures the motivations behind the emancipation, linking Alexander II's views on serfdom and the aftermath of the Crimean War as significant factors that drove the need for reform.