challenge: What is the origin of the surname 'Bowers'?
  
  A. Derived from the Celtic word 'bow' meaning 'a type of river'
  B. Derived from the Old English word for 'stronghold' or 'fortress'
  C. Derived from the Norman word 'bower' meaning 'a type of tree'
  D. Derived from the Saxon word 'bur' meaning 'a chamber; a cottage; a shady recess'
  Answer: 