Triple

Target entity: Lewis and Clark Expedition
Context triple: [Gates of the Mountains, namedDuring, Lewis and Clark Expedition]

• A. Lewis and Clark Expedition chosen
  The Lewis and Clark Expedition was an early 19th-century American exploratory journey that mapped and studied the newly acquired western territories, establishing routes and relations that greatly expanded U.S. geographic and scientific knowledge.
• B. Lewis & Clark Pioneers
  The Lewis & Clark Pioneers are the intercollegiate athletic teams representing Lewis & Clark College in NCAA Division III competition.
• C. 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.
• D. Pike expedition to the headwaters of the Mississippi River
  The Pike expedition to the headwaters of the Mississippi River was an early 19th-century U.S. exploratory mission led by Zebulon Pike to locate the river’s source and assess the northern Louisiana Purchase region.
• E. Powder River Expedition
  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.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.