Answer:
Personification.
Explanation:
Clouds cannot sail, they are applying a human attribute/action (Sailing) to a cloud.
The cloud sailed across the blue sky is, 'personification'.
Personification is the representation of something non-human or abstract.
Because from the given sentence the clouds are personified as sailing across the blue sky, as sailing is humanly activity, which means this sentence, The cloud sailed across the blue sky is the example of personification.
Hence the correct option is, 'Personification'
To know more about personification:
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