Answer:
"Fog" uses metaphor, while "Mending Wall" does not.
Step-by-step explanation:
In Carl Sandburg's "Fog", the speaker uses metaphor when talking about the fog. Sandburg describes the fog as "looking over harbor and city" and then moving on.
On the other hand, Robert Frost's poem "Mending Wall" does not use metaphor. Instead, Frost focuses on the theme of the relationship between the neighbors.
Thus, the correct answer is the second option.