It creates the feeling that New York is a living being.
Personification is giving nonhuman things human-like traits. In the sentence New York is described as having pockets and breathing. It's also described as having a morning and a night. These are all things a living being has. There are no noises besides breathing described, and this is not noisy. The conditions are also not described as being crowded. The tone is not predatory or negative so this also eliminates option B.