Answer :
The use of figurative language in the poem conveys the tone because he creates a playful feeling by using metaphor to compare fog to a cat.
What is a metaphor?
As a figure of speech its makes a direct comparison between elements that are not related in order to create an image in the reader's mind.
Here, an example of a metaphor that compares fog with a cat is seen as the metaphor helps to create a playful feeling
Therefore, the Option B is correct.
Read more about "Fog" by Carl Sandburg
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