challenge: Where is the Rancheria River located?
  
  A. In the southern Yukon Territory, Canada, near the border with Alberta
  B. In the central Yukon Territory, Canada, near the city of Whitehorse
  C. In the southern Yukon Territory, Canada, just north of the border with British Columbia
  D. In the northern Yukon Territory, Canada, near the border with Northwest Territories
  Answer: 