Which one of the following sentences is an example of a metaphor?

A. The breeze blew the branches back and forth.

B. She eats like a bird.

C. I'm as hungry as a wolf.

D. I am a rock.

A. The breeze blew the branches back and forth

Metaphor means a figure of speech in which a word or phrase is applied to an object without use like or as

A metaphor is a piece of figurative language that compares two unlike things without using the terms "like" or "as". Off the bat, you can eliminate B and C, because they include these words. Option A is a piece of prose, it makes no comparisons.

The answer is D, because it compares the subject, "I" (most likely a person), to a rock (which is not a person).