What are two basic causes of prison riots?

The correct answer highlights that understanding the causes of prison riots often involves recognizing both intrinsic and extrinsic factors that can lead to unrest within correctional facilities. Internal conflicts may arise from disagreements among inmates, competition for resources, or social hierarchies, while external unrest might stem from societal issues, economic conditions, or political movements influencing the prison environment. Both internal and external pressures can culminate in a situation conducive to riots.

The other options, while they mention critical issues surrounding prisons, do not encompass the broader spectrum of causes that can lead to riots as effectively as the correct choice. For instance, referencing "prison causes and public causes" suggests a separation that doesn’t fully illustrate all contributing factors; hence it’s less comprehensive. Lack of resources and overcrowding certainly contribute to tension, but they represent symptoms rather than root causes. Lastly, while the influence of gangs and poor leadership are significant issues, they are more specific factors that would fit under the broader categories highlighted in the correct answer. Understanding both internal and external strife can provide a more holistic view of the potential for riots in the correctional setting.