Triple

Target entity: Ukrainian–Soviet War
Context triple: [Arsenal (1929 film), setInPeriod, Ukrainian–Soviet War]

• A. Ukrainian War of Independence chosen
  The Ukrainian War of Independence was a complex series of military and political struggles (1917–1921) in which various Ukrainian, Bolshevik, White, Polish, and anarchist forces, including those led by Nestor Makhno, fought over the future and sovereignty of Ukraine following the collapse of the Russian Empire.
• B. Polish–Ukrainian War
  The Polish–Ukrainian War was a 1918–1919 armed conflict between the newly re-emerging Polish state and Ukrainian forces over control of Eastern Galicia and its capital, Lviv, in the chaotic aftermath of World War I.
• C. Crimean campaign of 1920
  The Crimean campaign of 1920 was a late-stage Russian Civil War operation in which Bolshevik forces fought to seize control of the Crimean Peninsula from White Army troops before the final Red offensive at Perekop and Chongar.
• D. Polish–Soviet War
  The Polish–Soviet War (1919–1921) was a major post–World War I conflict between the newly re-established Poland and Soviet Russia that helped determine the borders of Eastern Europe and the fate of the region’s independence movements.
• E. Soviet–Hungarian War
  The Soviet–Hungarian War was a 1945 military campaign in which the Soviet Union invaded and occupied Hungary during the final stages of World War II, leading to the fall of Nazi-aligned Hungarian forces and the establishment of a pro-Soviet regime.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.