What is the minimum distance a vehicle must be from a pedestrian crossing or a marked school crosswalk?

Answer: C — 5 feet

Pedestrian crossings and marked school crosswalks are designated areas for pedestrians to cross the road safely. As such, it is important for drivers to maintain a safe distance from these areas to avoid any accidents or collisions with pedestrians. Option A and D, 15 feet and 20 feet respectively, may seem like reasonable distances but they are too far from the crossing/crosswalk and may not provide enough reaction time for the driver to brake in case a pedestrian suddenly crosses. Option B, 10 feet, is closer to the correct answer but still not the minimum distance required by law. Option C, 5 feet, is the correct answer as it is the minimum distance a vehicle must be from a pedestrian crossing or a marked school crosswalk to ensure the safety of both pedestrians and drivers.