Answer: B) Simile.
Explanation: A simile is a figure of speech that consists in making a comparison between elements that aren't obviously related, this comparison is made using the words "like" and "as." In the given line from "The Iliad" by Homer, we can see an example of a simile that compares Hector's gloom to the night, by using the word "as." So the correct answer is the corresponding to option B.