Triple

Target entity: Powder River Expedition
Context triple: [Powder River Country, significantEvent, Powder River Expedition]

• A. Powder River Expedition chosen
  The Powder River Expedition was an 1865 U.S. Army campaign against Plains tribes in present-day Wyoming and Montana, aimed at securing overland travel routes and asserting federal control in the northern Great Plains.
• B. Washburn–Langford–Doane Expedition
  The Washburn–Langford–Doane Expedition was an 1870 exploratory survey of the Yellowstone region whose reports helped lead to the creation of Yellowstone National Park.
• C. Red River Expedition
  The Red River Expedition was a Canadian military campaign in 1870 sent to the Red River Colony (in present-day Manitoba) to assert federal authority and respond to Louis Riel’s provisional government during the Red River Rebellion.
• D. McClure expedition
  The McClure expedition was a mid-19th-century British Arctic voyage led by Robert McClure that is credited with the first traversal of the Northwest Passage, albeit partly by sledge over ice.
• E. Custer Expedition of 1874
  The Custer Expedition of 1874 was a U.S. Army reconnaissance mission led by Lt. Col. George Armstrong Custer into the Black Hills that publicized the region’s gold deposits and helped trigger the Black Hills Gold Rush.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.