How are song duels adaptive among the Inuit?

How are song duels adaptive among the Inuit?
 
  a. The song duel allows Inuit to teach young children the epic stories of their ancestors.
  b. Through song battles, the Inuit orchestrate very specific corporal types of punishment.
  c. Through means of verbal dexterity the Inuit are able to publicly deride someone guilty of transgression.
  d. The song duels are used because the Inuit cannot carry weapons and have no way to punish each other.
  e. The song duels wear out the participants through singing and it diminishes a great deal of conflict.