challenge: What is the condition set by the galactic government for a group from a fantasy world to return home?
  
  A. They must agree to undergo a series of scientific experiments to study their magical abilities
  B. They must agree to join the galactic military to fight against an evil alien threat
  C. They must agree to become ambassadors for their world in the galactic government
  D. They must agree to travel back to their fantasy universe to assess the power of an evil wizard
  Answer: 