How does the metaphor in this passage most clearly support the authors purpose?

I would say C; because "It compares unforgiveness to drinking poison to show that it hurts the offended more than the offended."

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).