Answer:
Taking a long journey.
Getting help from a powerful being.
Fighting a strong antagonist.
Explanation:
A Greek mythologies, the hero is depicted as a character of normal stature who has to undergo hazardously and oftentimes, long journeys to prove his worth. The involvement of powerful beings like gods and goddesses providing assistance to the hero also plays a huge part in the hero's characterization. Similarly, fighting against a strong antagonist also characterizes the hero.
In the myth of Perseus, the hero Perseus had to fight Medusa, after going through a long journey. And in that mission, he was helped by Hermes and his sister Athena, who provided him with a polished shield to prevent Perseus from being turned into a stone.
Thus, the correct answers are the first, second, and third options.
