challenge: What is the result of Clements' split of the Crowned chat-tyrant species?
  
  A. The division of the species into two distinct species: Crowned chat-tyrant and Peruvian chat-tyrant
  B. The reclassification of the entire species as Peruvian chat-tyrant
  C. The elimination of the Crowned chat-tyrant species
  D. The creation of a single new subspecies
  Answer: 