I say b because I don’t see a claim neither good reasoning
I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
Hope this helps!
Declarative sentences( End in period, like the sentence I am writing now), Exclamatory sentences(End in exclamation mark), Interrogative sentences(End in question mark), Imperative sentences(giving a command), and Conditional sentences(If____________, I would_____________.).
Silence, quietness. "Thou still unravish’d bride of quietness" directly referring to a silent person.
