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).
It's called Ship Trap Island because Zaroff needs men to hunt, so he literally causes ships to break up. He has installed lights to make it look as if a channel exists. In reality, the channel isn't there, but jagged rocks are that can tear a ship up, disabling it or causing it to sink.
