challenge: What were some of the pseudonyms used by Émile Masson?
  
  A. Émile Durand, Jean Le Fleur, and Pierre Dupont
  B. Louis Le Roux, Maurice Le Floc'h, and François Le Gac
  C. Brenn, Ewan Gweznou, and Ion Prigent
  D. Yves Le Gall, Marcel Le Guen, and Georges Le Meur
  Answer: 