Which trait, in excess, did the ancient greeks feel could bring about even the most celebrated hero's downfall?
a. humor
b. optimism
c. pride
d. intelligence

Pride because Odysseus was so proud of himself and had a giant ego. In the story, ¨The Odyssey¨, while him and his crew are trying to get away from the Cyclops on the Island of Crete he keeps mocking the cyclops saying nobody defeated you! My name is Odysseus, and I am from Ithaca son of Laértes! His pride was too much and even though he got away from the Cyclops his crew kept telling him to leave the Cyclops alone. His ego and pride comes to play a lot in the story. Every problem he faces his pride comes out.
So I would say pride!

Hope this helps!
Have a nice day!

Not sure this is a hard one huh