challenge: What is the approximate distance from Chesterfield to Carlinville, the Macoupin county seat?
  
  A. 12 miles (19 km) via Routes 111 and 108
  B. 7 miles (11 km) via Route 111
  C. 15 miles (24 km) via Route 111 and Interstate 55
  D. 5 miles (8 km) via Route 108
  Answer: 