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." In the given line from the poem "A Red, Red Rose" by Robert Burns, we can see an example of a simile that compares the speaker's love to a red rose, using the word "like" so the correct answer is option A.