Triple

Target entity: Army of the Potomac
Context triple: [Ambrose E. Burnside, commanded, Army of the Potomac]

• A. Army of the Potomac chosen
  The Army of the Potomac was the principal Union field army in the Eastern Theater of the American Civil War, best known for its major campaigns against Confederate forces in Virginia.
• B. III Corps, Army of the Potomac
  III Corps, Army of the Potomac was a major Union infantry corps in the American Civil War, noted for its hard fighting and heavy losses in key battles such as Gettysburg.
• C. V Corps (Army of the Potomac)
  V Corps (Army of the Potomac) was a major Union Army corps in the American Civil War, noted for its prominent role in many key Eastern Theater battles under commanders such as Fitz John Porter and Gouverneur K. Warren.
• D. Union V Corps
  Union V Corps was a major infantry formation of the Union Army of the Potomac during the American Civil War, noted for its significant combat role in key battles such as Gettysburg.
• E. First United States Army
  The First United States Army is a major field army formation of the U.S. Army that played a key role in European operations during World War II, including the Battle of the Bulge.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.