Answer: A) Alliteration.
Explanation: alliteration is a literary device that consists in the repetition of the beginning sounds of consecutive words, or words that are close to each other. In the given line, we can see an example of the use of alliteration, in the repetition of the "f" sound in the words "frightening," "flap," and "feathered." This repetition is used to convey the idea of the actual sound of the wings.
