Triple

Target entity: Missouri River
Context triple: [Western Montana, hasRiver, Missouri River]

• A. 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.
• B. Mississippi River
  The Mississippi River is one of the longest and most significant rivers in the United States, serving as a major waterway for transportation, commerce, and drainage across much of the central continent.
• C. Niobrara River
  The Niobrara River is a scenic waterway in northern Nebraska known for its unique mix of Great Plains, Sandhills, and forest ecosystems and popular for canoeing, tubing, and wildlife viewing.
• D. Red River of the North
  The Red River of the North is a northward-flowing river forming much of the border between North Dakota and Minnesota before continuing through Manitoba to Lake Winnipeg, and is known for its fertile valley and frequent flooding.
• E. Yellowstone River
  The Yellowstone River is a major free-flowing river in the western United States that originates in Yellowstone National Park and flows through Wyoming, Montana, and North Dakota before joining the Missouri River.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.