At a pedestrian crosswalk, what must Stella do upon seeing the appropriate sign?

Answer: A — Make a complete stop without blocking the crosswalk

Upon seeing the appropriate sign at a pedestrian crosswalk, the correct action is to make a complete stop without blocking the crosswalk. This is crucial because crosswalks are designated areas where pedestrians have the right of way, allowing them to cross safely. By stopping completely, Stella ensures that any pedestrians waiting to cross can do so without fear of being obstructed or endangered by moving vehicles. Additionally, making a complete stop at a crosswalk helps reinforce traffic laws that prioritize pedestrian safety. It facilitates smoother traffic flow by allowing vehicles to clear the crosswalk entirely before resuming movement, thus preventing any potential congestion or accidents. This action demonstrates responsible driving behavior and adherence to traffic regulations designed to protect those on foot.