I believe it’s a) a simile. I hope this helps:)
I think the correct answer is Choice "C" because imagery is supposed to make the reader visualize something in their mind or imagination.
I've encountered a question about this that asks for the interrupter of the sentence? If I'm correct, then the answer is 'naturally'. The word 'naturally' is an interrupter because it stops the flow of the sentence. It could've been put at the last part in order to not interrupt the sentence.