challenge: What is the relationship between Oregon Route 99 and U.S. Route 99?
  
  A. Oregon Route 99 is a detour route for U.S. Route 99
  B. Oregon Route 99 was formed from parts of the former U.S. Route 99
  C. Oregon Route 99 is a continuation of U.S. Route 99
  D. Oregon Route 99 is a completely new route unrelated to U.S. Route 99
  Answer: 