According to the guidelines of good journalism, which of the following is correct:

A. Miami city hall
B. Miami and West Palm Beach City Halls
C. Miami City Hall
D. A and B

C. Miami City Hall.

According to the guidelines of good journalism, it is important to be precise and avoid unnecessary words or information. Therefore, the most correct option would be to refer to the specific entity, in this case, "Miami City Hall", rather than using the plural form or adding another city's name.