Why does the author use compare and contrast in “here is new york”?

a. to draw attention to the different types of new yorkers and how they define the city

b. to emphasize that new york is meant only for a specific type of person

c. to illustrate how new york is changing and to express how it should continue to change in the future

d. to create a platform where the writer can argue the pros and cons of commuting to the city