The correct answer is "the downfall of the protagonist"
This is the whole purpose of plays, according to Aristotle. The protagonists in tragedies are usually people better than us who die for a great cause, and their death awakens both positive and negative emotions in us. This is called catharsis.
D. “From there we reached the border that divided....I witness the horrendous art of justice.” (Apex)
I'm not sure since I can't read the passage, but I think D is least important.
O Duncan has a male named Malcom