The correct answer is A) challenging someone to a fight."
A common tactic of the characters in folktales is "challenging someone to a fight."
For better understanding, we can say that a folktale is a story based on myths or a folk story that has passed from generation to generation. Many times in some cultures people call it "legend."
For instance, the legend of Robin Hood in Britain.
A lot has been written about the legend of Robin Hood. And that is exactly what it is, a legend. There are no official recording historic sources that can prove the existence of this particular character, but as you know, is a flok hero, a legend for the British people.
And yes, A common tactic of the characters in folktales is "challenging someone to a fight."