Freeway shoulders are often A: marked with broken yellow lines B: gravelly and contain debris C: used while driving during rush hour D: the site of most freeway accidents E: closed to through traffic

Freeway shoulders are often

B. gravelly and contain debris.

This is because they're on the side of the road, not on the drivable part. They contain debris because any garbage/parts that come off of the vehicles gets pushed to the sides as other vehicles drive past.