Answer: d. The Russian Revolution led to major disagreements about the country’s political future, resulting in war.
Explanation: The Russian Revolution of 1917, particularly the Bolshevik Revolution in October, led to significant political changes in Russia. The Bolsheviks, led by Vladimir Lenin, seized power and established a socialist government. However, this change sparked disagreements and opposition from various factions, including the White Army (anti-Bolshevik forces) and other political groups.
These conflicts and disagreements evolved into the Russian Civil War (1918-1922). The war was characterized by intense fighting between the Red Army (Bolsheviks) and the White Army (anti-Bolshevik forces), as well as various other factions. The Russian Civil War was, in part, a consequence of the political and ideological differences that emerged after the Russian Revolution.