challenge: What is the total area of Rock Dell Township, Olmsted County, Minnesota?
  
  A. 25.0 square miles (64.7 km2)
  B. 50.0 square miles (129.5 km2)
  C. 40.0 square miles (103.6 km2)
  D. 36.0 square miles (93.3 km2)
  Answer: 