What action should you take if you see a pedestrian at a crosswalk?

When you see a pedestrian at a crosswalk, the appropriate action is to come to a complete stop. This is crucial to ensure the safety of the pedestrian, allowing them to cross the street safely. Crosswalks are designated areas where pedestrians have the right of way, and stopping not only complies with traffic laws but also promotes responsible driving behavior.

Maintaining speed or speeding up, as suggested by other options, would not only be unsafe but could also result in serious accidents or injuries. Similarly, using your horn does not contribute to the safe passage of pedestrians; it may even startle them or cause confusion. Therefore, stopping for pedestrians at crosswalks is not just a legal obligation, but also a fundamental aspect of being a considerate driver.