When encountering a pedestrian crossing at an unmarked crosswalk, the appropriate action is to stop and allow them to cross. This is mandated by traffic laws, which are designed to protect pedestrians on roadways, especially in areas where there may not be a designated crosswalk.
Unmarked crosswalks indicate that pedestrians still have the right of way and drivers must yield, regardless of whether there are painted lines on the road. This rule emphasizes the importance of ensuring pedestrian safety and encourages drivers to remain vigilant and aware of individuals who may be crossing the street.
The other options are not in line with these safety regulations and could lead to dangerous situations for pedestrians. Therefore, stopping to let them cross reinforces the responsibility of drivers to prioritize pedestrian safety.