b. the yellow smoke that rubs its muzzle on the window panes, locked its tongue into the corners of the evening, lingered upon the pools that stand in drains
In Prufrock's poem, he is comparing the smoke to an animal when it talks about the smoke having a muzzle and tongue. It shows how the smoke moves through the city and gets into all the different places. Carl Sandburg's poem compares the fog to a cat when it says that it "comes on little cat feet" and "it sits...on silent haunches". In his poem, the fog walks in and observes the harbor and city before it "moves on".