The second morning of the vigil, August discovers a suicide
note out nearby where they found May's body. May penned that August and June
should not be miserable, but in its place be happy that May is with her parents,
sibling, and grandmother. Even though she was exhausted of carrying the blues
of the world, it was her stage to pass away but their time to live. August
tells June she need to marry Neil and stop being scared to take a risk.
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).