The fourth statement is the most accurate: "The Russian Revolution led to major disagreements about the country’s political future, resulting in war."
The Russian Revolution, which took place in 1917, resulted in the overthrow of the tsarist regime and the establishment of a provisional government. However, this change did not resolve the underlying political, social, and economic issues facing Russia. The revolution created divisions among various factions, including the Bolsheviks, the Mensheviks, and other socialist and nationalist groups, each with differing visions for Russia's future.
These disagreements culminated in the Russian Civil War, which lasted from 1917 to 1922. The main conflict was between the Bolshevik government (the Red Army), which sought to consolidate power and implement communist policies, and a loose coalition of anti-Bolshevik forces (the White Army), which included monarchists, liberals, and other groups opposed to Bolshevik rule.
Thus, the Russian Revolution set the stage for the Civil War by creating a power vacuum and deepening political divisions within Russia.