Answer:
Correct answer is Aristotle.
Step-by-step explanation:
Among the mentioned writers Aristotle is the one that was in some way a role model to Freytag. It is interesting that all other mentioned writers were writing tragedies, but it is Aristotle who influenced Freytag.
Aristotle explained his attitude in his work Poetics, while Freytag developed his ideas in his analysis of tragedy.