Antonio witnessed the start of a fight between Cesario and Sir Andrew. However, he mistakes Cesario for Sebastian and for fear that Sebastian will get hurt or be killed in the fight, he pulls out his sword and goes towards Sir Andrew stating that he will fight in Sebastian's place. This all draws the attention of Illyrian officers, who, observing the scene, recognize Antonio and remember that he is a wanted fugitive in Illyria and, therefore, finish the fight by arresting Antonio.
The correct answer is B. The rhythm and rhyme pattern
Ballads have specially designed meters and numbers of stanzas which are easily recognizable and they make ballads specific and diverse from other types of narrative poems.