Respuesta :
a. Former republics are more difficult to rule than hereditary states, and they will rebel if they are not tightly controlled.
We can see that the best option that actually states the main idea is: Former republics are more difficult to rule than hereditary states, and they will rebel if they are not tightly controlled.
What is main idea?
Main idea has to do with the important idea or thought that the author is trying to pass across to the readers or audience. It is also seen in the theme of the text or passage.
We can see that the main idea of the passage is that former republics are more difficult to rule than hereditary states, and they will rebel if they are not tightly controlled.
Learn more about main idea on https://brainly.com/question/25088072