challenge: What is the typical size range of the shell of Amalda jenneri?
  
  A. 7-12 mm in length and 6-9 mm in diameter
  B. 10-17 mm in length and 5.2-8 mm in diameter
  C. 12-15 mm in length and 4-7 mm in diameter
  D. 5.2-8 mm in length and 10-17 mm in diameter
  Answer: 