challenge: What is a distinctive characteristic of the bands on a male banded killifish's body?
  
  A. They are yellow and only appear on the pectoral and pelvic fins
  B. They are silvery in color and closer together, with more than 9 bands anterior to the dorsal fin
  C. They are thin and distinct black bands that span the full width of the body
  D. They are bright blue and only appear on the anal fin
  Answer: 