Final answer:
In a school zone, a driver needs to stop whenever directed by a signal or crossing guard to ensure pedestrian safety and manage traffic flow. Correct answer is C) whenever directed by a signal or crossing guard.
Step-by-step explanation:
In a school zone, a driver may need to stop whenever directed by a signal or crossing guard. This is because pedestrian safety is a significant concern around schools. Many students and others need to cross the street at various times during the school day, and traffic signals along with crossing guards help manage traffic flow to ensure their safety. Additionally, traffic signals can compel vehicles to slow down and adhere to speed limits, further enhancing safety.
It's important to note that the need to stop is not simply when there are school buses on the street, whenever school is in session, or whenever there are students on the sidewalk. Drivers are required to stop when there is a specific signal to do so or when a crossing guard indicates it is necessary. So, the correct answer is C) whenever directed by a signal or crossing guard.