challenge: Where is the Soda Lake Geothermal Field located?
  
  A. East of the city of Reno, Nevada in Washoe County
  B. Northeast flank of the Soda Lakes volcano, west of the city of Fallon, Nevada in Churchill County
  C. North of the city of Las Vegas, Nevada in Clark County
  D. South of the city of Fallon, Nevada in Nye County
  Answer: 