Answer: D. Hyperbole.
Explanation: A hyperbole is a figure of speech that consists in the exaggeration of a statement or a characteristic, that is not meant to be taken literary. In the given sentence, we can see a clear example of hyperbole, specifically in the phrase "It would put nations on the alert" because it is saying that the bird was so loud that it would put nations on the alert, which is a clear exaggeration to give the idea of how loud the bird was.
