Imagine that a group of people attack and defeat another group. then the first group's leader becomes the ruler of the defeated group. this example best illustrates which theory?

This example best illustrates "force" theory.

Force theory happens when a man or a gathering of individuals take control of a region, for example, a state, and make everybody here take after their tenets and convictions.  

In this theory, a gathering of individuals go into a domain, take it by FORCE, at that point drive the legislature on to the locals.

Force theory happens when a man or a gathering of individuals take control of a zone, for example, a state, and make everybody here take after their standards and convictions. For instance, on the off chance that you were to effectively attack Canada and make everybody in the nation relinquish their old ways and receive my new standards, it would be a showing of Force theory.

a would be the answer