challenge: What are the four life stages of Vampyrella lateritia?
  
  A. Motile trophozoites, plasmodia, digestive cysts, resting cysts
  B. Active trophozoites, plasmodia, digestive cysts, resting cysts
  C. Motile trophozoites, plasmodia, reproductive cysts, dormant cysts
  D. Active trophozoites, plasmodia, reproductive cysts, dormant cysts
  Answer: 