Final answer:
The best example illustrating the dangers of majority rule is when a Southern state passes laws discriminating against African Americans.
Step-by-step explanation:
The best example illustrating the dangers of majority rule is option a) A Southern state passes laws discriminating against African Americans. This example highlights how majority rule can lead to the violation of minority rights and result in discrimination and inequality. It shows how a majority can use their power to oppress and marginalize a minority group.