I believe it is personification because he is giving the sand the ability to stretch and to be alone which sand cannot do.
Answer:
C. Imagery
Explanation:
Imagery is a literary device that uses descriptive words to help you visualize what is happening in the story. Some words that were used here to depict this are "purple", "blueberry", and "rivers"
C. aroma
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He was afraid that one of them would eventually become strong enough to overthrow him and take his power.