Revolutions have most often occurred in nations in which - a there is a relatively small population of impoverished citizens b social, political,or economic dissatisfactior exists C citizens can participate in the political process d social mobility is encouraged

The correct answer is b. Revolutions have most often occurred in nations in which social, political, or economic dissatisfaction exists. When there is widespread discontent among the population due to issues such as inequality, oppression, or lack of political representation, it can lead to revolutionary movements and uprisings.