challenge: What event led to the formation of the German heavy metal band Rebellion in 2001?
  
  A. The departure of Uwe Lulis and Tomi Göttlich from Iron Maiden
  B. The release of their debut album
  C. The reunion of Uwe Lulis and Tomi Göttlich from their previous band
  D. The departure of Uwe Lulis and Tomi Göttlich from Grave Digger
  Answer: 