D is the correct answer because it says "dark sky puffs" which we can infer, is a dark raincloud. A kenning is a special figure of speech in which two words are combined to create an expression to refer to a thing or person. In this case, dark clouds are referred to as Dark sky puffs.
We can also use the elimination process to help eliminate wrong answers.
A is an example of an Alliteration so therefore it is not the correct answer.
C. Is an example of a rhyme, Tell/ rhymes with Well.
