Answer: A) Simile.
Explanation: A simile is a figure of speech that consists in making a comparison between elements that aren't obviously related, this comparison is made using the words "like" and "as." A metaphor is also a comparison, but it is direct, without using the words "like" or "as." In the given sentence we can see an example of a simile that compares the color of someone's lips to rubies.
