The best answer among the following choices would be the third option C).
Allusion is a figure of speech, in which an object or circumstance from unrelated context is referenced covertly or indirectly. It is left to the audience to make the direct connection; where the connection is directly and explicitly stated by the author, it is instead usually termed a reference
Metaphors are figures of speech in which, something is referred to, but not directly.
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Hope this helps! :)
