challenge: What event sparks the conflict in the story of Gunnars þáttr Þiðrandabana?
  
  A. Asbjorn Cliff's default on his debts and subsequent flight from creditors
  B. Ketil Thrym's feud with his foster-son Thidrandi
  C. Gunnar's arrival at Njardvik
  D. Thidrandi's attack on Ketil Thrym's farm
  Answer: 