I had no idea,but I think it is D.
Answer:
Personification.
Explanation:
Personification is defined as <em>attributing human characteristics to nonhuman</em>, or in this case, attributing the characteristics of "<em>stooping</em>" and "<em>leans down</em>" to the sky. The sky does not technically stoop or lean down, but is described as such.
Learn more about personification, here:
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The art of persuading people to agree with you best describes the definition of rhetoric.