When there are no traffic control signals, drivers must do what for pedestrians within unmarked and marked crosswalks?

Answer: B — Slow down or stop

When there are no traffic control signals present, drivers are required to slow down or stop for pedestrians in both marked and unmarked crosswalks to ensure their safety. This rule emphasizes the importance of yielding the right-of-way to pedestrians, as they are more vulnerable than vehicles. By slowing down or coming to a stop, drivers provide pedestrians the opportunity to cross safely. The expectation is that drivers must always prioritize pedestrian safety, and successful navigation of crosswalks is critical in urban areas where foot traffic is common. Understanding this rule serves to promote awareness and consideration on the roads, ultimately reducing the likelihood of accidents involving pedestrians.