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: Missouri River valley | Statement: [Union County, South Dakota, locatedOn, Missouri River valley]

Target entity: Missouri River valley
Context triple: [Union County, South Dakota, locatedOn, Missouri River valley]

• A. Mississippi River valley
  The Mississippi River valley is a vast, fertile lowland region in the central United States shaped by the Mississippi River, historically crucial for agriculture, trade, and settlement.
• B. Missouri River chosen
  The Missouri River is the longest river in North America, flowing from the Rocky Mountains of western Montana to join the Mississippi River near St. Louis.
• C. Upper Mississippi Valley
  The Upper Mississippi Valley is a region along the upper course of the Mississippi River, encompassing parts of several Midwestern U.S. states and historically significant for trade, settlement, and military activity.
• D. Mississippi River basin
  The Mississippi River basin is the vast drainage area of the Mississippi River system, encompassing much of the central United States and parts of Canada and covering one of the largest river basins in the world.
• E. Arkansas River region
  The Arkansas River region is a historic and culturally significant area in the central United States shaped by the course of the Arkansas River, long serving as a corridor for Indigenous peoples, trade, and settlement.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.