The answer is: [A]: "figurative language" .
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Specifically, a "simile" is being used—that is, a comparison of two unlike things using "like" or "as":
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"beard and hair hung straight down like seaweed" ;
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and a "similie" is a type of "figurative language".
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Technically speaking, "alliteration" , which is: choice: [C] , is being used, which is a type of figurative language: "hair hung" ; "straight...seaweed";
However, the best answer choice—and correct answer choice—is:
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[A]: "figurative language" .
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