Final answer:
Revolutions can indeed be violent or nonviolent and can also transition from nonviolent to violent as seen in historical contexts such as the nonviolent market revolution in the US and the violent political conflicts in Libya and Syria. The correct option is A.
Step-by-step explanation:
The statement that revolutions may be violent or nonviolent, and may begin nonviolently and become violent, is A. True. Throughout history, there have been various forms of revolutions. For example, the market revolution in the United States, which significantly altered the economic and social landscape of the nation, was primarily a nonviolent transformation characterized by technological advancements and changes in production and labor systems.
However, in contrast, the political unrest in countries such as Libya and Syria escalated into violent conflicts, with multiple groups fighting against the established government and each other, making peaceful solutions complex. This reflects the broad spectrum of how revolutions can unfold, from systemic changes via reform to full-fledged armed struggles.