During which condition should a driver specifically be alert for pedestrians?

Answer: B — At crosswalks and near schools

Being particularly alert for pedestrians at crosswalks and near schools is essential for driver safety and pedestrian protection. These areas are designated for pedestrians to cross streets safely, and children are often present around schools, especially during the school opening and closing times. Traffic around schools can be busy, and the likelihood of pedestrians entering crosswalks increases, making it crucial for drivers to be vigilant in these locations to prevent accidents. While other options may have their own considerations for pedestrian awareness, crosswalks and school zones are specifically marked areas where higher pedestrian traffic is expected, significantly increasing the need for caution and attention from drivers.