Which of the following is NOT considered a peaceful demonstration?

The correct choice specifies a violent assembly as not being considered a peaceful demonstration. Peaceful demonstrations are characterized by their non-violent nature, where participants express their views, concerns, or demands without resorting to aggression or harm.

A scheduled protest, a spontaneous march, and a free speech activity all typically emphasize the right to peacefully gather and express opinions. These activities are performed within the bounds of law and encourage dialogue or awareness rather than conflict. In contrast, a violent assembly encompasses actions that may lead to harm or destruction, fundamentally contradicting the principles of peaceful demonstration. Thus, it is clearly distinguished from the other options that align with lawful and civil expressions of dissent.