Answer: C) Charybdis is being described as a human who can "gulp".
Explanation: In the given excerpt of "The Odyssey" by Homer, we can see a brief description of the time when Odysseus passed between Scylla and Charybdis, after the Island of Sirens. Scylla is a six headed monster who swallows one sailor for each head, and Charybdis is a whirlpool that could swallow the entire ship, in the excerpt we can see the comparison of Charybdis with a human who gulps (..."the dreadful whirlpool gulped the salt sea down").
