The correct answer is D) Dividing China's history based on which dynasty ruled the country.
The action that is an example of periodization is "Dividing China's history based on which dynasty ruled the country."
When we are studying history, the term periodization means that we split historical time to better study those periods. Periodization is a process that helps us to classify or better study the past and put several moments in pieces of blocks for clarity purposes. These periods of time give us a better chance to understand the characteristics, moments, characters, dates and events of each time. That is why the action that is an example of periodization is "Dividing China's history based on which dynasty ruled the country."