The 3/5 compromise is when 3 out of 5 slaves count for representatives . So this represents the interest of both northern and southern states by showing that they wanted representation in population in order for each state to be more powerful than the other.
The most likely theme to be found in a medieval ballad would be A - the battle of good versus evil. Medieval ballads often focused on struggles where the good would have to defeat the evil; angels defeating satan; a good and charming prince defeating an evil and usurping force, etc.
If you can provide a picture, I will reply to this comment with an answer.
