Triple

Target entity: Avar–Sasanian siege of Constantinople
Context triple: [Siege of Constantinople (626), alsoKnownAs, Avar–Sasanian siege of Constantinople]

• A. Siege of Constantinople (626) chosen
  The Siege of Constantinople in 626 was a major failed joint Avar and Sasanian attempt to capture the Byzantine capital, marking a decisive turning point in the Roman–Persian Wars.
• B. Siege of Antioch (540)
  The Siege of Antioch (540) was a major Sasanian Persian capture and sack of the prominent Byzantine city of Antioch under King Khosrow I, marking a pivotal moment in the Roman–Persian conflicts of Late Antiquity.
• C. Siege of Amida
  The Siege of Amida was a major 6th-century confrontation in which Sasanian Persian forces captured the fortified Byzantine city of Amida, highlighting the intense struggle for control in the eastern frontier during Justinian’s reign.
• D. Siege of Nicomedia
  The Siege of Nicomedia was an early 14th-century Ottoman campaign that captured the important Byzantine city of Nicomedia, marking a key step in the Ottoman expansion into northwestern Anatolia.
• E. Siege of Byzantium (324)
  The Siege of Byzantium (324) was a key military engagement in which Constantine the Great besieged and captured the strategically vital city of Byzantium during his final civil war against Licinius, paving the way for his sole rule of the Roman Empire.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.