Read the excerpt below and answer the question.
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Let us all hope that the dark clouds of racial prejudice will soon pass away and the deep fog of misunderstanding will be lifted from our fear-drenched communities, and in some not too distant tomorrow the radiant stars of love and brotherhood will shine over our great nation with all their scintillating beauty.
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What figure of speech is King employing in this excerpt from "Letter from Birmingham Jail" when he refers to dark clouds, deep fog, and radiant stars?

A.allusion

B.hyperbole

C.metaphor

D.simile