Step 1: Understanding the Concept:
This is a factual recall question asking to identify the poet of the given lines.
Step 2: Detailed Explanation:
The lines "The fog comes / on little cat feet." are the beginning of the poem "Fog". This poem was written by the American poet Carl Sandburg. The poem uses the metaphor of a cat to describe the quiet, stealthy arrival and departure of the fog.
Step 3: Final Answer:
The poet of "Fog" is Carl Sandburg. Thus, the correct option is (A).