In these lines from "In a Station of the Metro" by Ezra Pound, which literary device has the poet used to describe how people look?

The apparition of these faces in the crowd:

Petals on a wet, black bough.

symbolism to emphasize beauty

personification to describe similarity

metaphor to capture unexpected beauty

syntax to focuse on similarity

I believe Pound uses syntax to focus on similarity. He uses short words, without a verb, to make the scenery more vivid, but he does compare faces of the people in the crowd to petals. He isn't talking about beauty, but similarity between those two things. And since he isn't using personification here, the correct answer has to be the last one.