Why was ostracism practiced in ancient Athens? to allow officials to decide on laws
to allow immigrants to become citizens
to force people to participate on a jury
to remove people who were too powerful

To remove people who were too powerful

Explanation:

Ostacism was practiced by writing the name of the government offical that you wanted to cast out of Athens for 10 years. To other government officals, this was also an effecient way for getting rid of potential opponents.