Which sentence contains parallel structure?
This peaceful protest the workers staged in the parking lot has been witnessed by drivers, pedestrians, and residents
of the neighborhood.
The workers staged a peaceful protest in a parking lot of this active community, and it has been witnessed by all the
pedestrians who travel here.
A peaceful protest, witnessed by many, was held today in this parking lot; everyone who witnessed the workers' actions
will understand their ideals.
Every driver traveling down this road, every pedestrian crossing this street, every resident of this neighborhood has
witnessed the workers' peaceful protest.