People don't want to read what is historical, they want to read about adventures and story telling about how they could be better, no one would buy a book that no one wants to read.
Either would work, so c. either could be used.
This outline uses a point-by-point comparison to organize the details of a comparison-and-contrast essay.
(Subject-by-Subject would be reversed. Cities for headers to each section instead of topics to compare the cities by.)
Beginning point!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
