The answer is B: His encounter with Poseidon, who holds a grudge against Odysseus for blinding his son, presents the severest confrontation for the hero.
Odysseus, after being a decisive character in winning the war at Troy, has to return home by sea, but having blinded Poseidon´s son, Polyphemus, he is forced to face the rage and anger of the god of the sea. Poseidon then sets all kinds of obstacles for Odysseus making his travels perilous and long, to a point where, out of all his crew memebers, Odysseus is the only one who makes it back home alive.
Do you have more information?