Answer:
D. educated urban dwellers
Step-by-step explanation:
The statement "Successful revolutions are rooted in people well-off enough to know they could and should be better off" suggests that individuals who are educated and live in urban areas tend to be the leaders of successful revolutions. This is because these individuals have access to education and information that enables them to recognize the disparity between their current situation and a better future. They also tend to have social and economic connections that allow them to organize and mobilize others to join the revolution. In addition, living in urban areas may expose them to a wider range of political and social ideas, which can influence their thinking and motivate them to take action.