challenge: Where is Kuster Mill located?
  
  A. Evansburg State Park on Skippack Creek at Norristown, Pennsylvania
  B. Fairmount Park on Schuylkill River at Philadelphia, Pennsylvania
  C. Evansburg State Park on Skippack Creek at Collegeville, Skippack Township, Montgomery County, Pennsylvania
  D. Hershey Park on Swatara Creek at Hershey, Pennsylvania
  Answer: 