The subtleties from "Chicago" via Carl Sandburg that reflect attributes of innovation by Sandburg's willingness to write about both positive and negative characteristics of Chicag is Option B. i.e. It builds Sandburg's credibility.
The sonnet investigates the distinction that individuals who live in urban areas feel toward nature.
Sandburg catches the embodiment of city life through the different pictures of Chicago's occupants.
In this sonnet, the writer praises Chicago for the various sorts of individuals that can be seen as in that attempting to get by. There are individuals of various callings there.
Innovation is an individualistic lifestyle that stems from custom. The dustiness of the city shows estrangement from nature.
Likewise, the various arrangements of individuals from great to terrible feature the individualistic way of life that marks innovation.
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