Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Rus' invasion of Bulgaria (968–971) | Statement: [Boris II of Bulgaria, associatedWithEvent, Rus' invasion of Bulgaria (968–971)]

Target entity: Rus' invasion of Bulgaria (968–971)
Context triple: [Boris II of Bulgaria, associatedWithEvent, Rus' invasion of Bulgaria (968–971)]

• A. Kievan Rus' invasion of Bulgaria chosen
  The Kievan Rus' invasion of Bulgaria was a 10th-century military campaign in which Prince Sviatoslav I of Kiev overran much of the First Bulgarian Empire, reshaping the balance of power in Eastern Europe and prompting Byzantine intervention.
• B. Ottoman conquest of Bulgaria
  The Ottoman conquest of Bulgaria was the late 14th–early 15th century series of campaigns through which the Ottoman Empire subjugated and annexed the medieval Bulgarian states, ending their independence and integrating their territories into the Ottoman realm.
• C. Bulgarian invasion of Thrace
  The Bulgarian invasion of Thrace was an early 8th-century military campaign in which the First Bulgarian Empire attacked Byzantine territories in the Thracian region, challenging imperial control in the Balkans.
• D. Bulgarian occupation of Adrianople
  The Bulgarian occupation of Adrianople was a brief period in the mid-13th century when the Bulgarian Empire seized and controlled the strategically important city of Adrianople (modern Edirne) during the regional power struggles following the Fourth Crusade.
• E. War with the Second Bulgarian Empire
  The War with the Second Bulgarian Empire was a series of early 13th-century military campaigns in the Balkans between the Latin Empire and Tsar Kaloyan’s Bulgaria, marked by the capture of Emperor Baldwin I and the decisive Bulgarian victory at the Battle of Adrianople in 1205.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.