challenge: Where does K-68 highway begin in Kansas?
  
  A. At the Marais des Cygnes River, near Pomona
  B. In Louisburg at the intersection of US-169 and K-7
  C. In downtown Ottawa at the intersection of I-35 and US-59
  D. At US-75 and K-31, about a mile south of Lyndon
  Answer: 