Final answer:
The appropriate action for a driver in this scenario is to stop and wait for the pedestrians to cross safely.
Step-by-step explanation:
In this scenario, the appropriate action for a driver is option b) Stop and wait for the pedestrians to cross safely. When pedestrians have a walk signal and have entered a crosswalk, it is the responsibility of drivers to yield and allow them to cross safely. A green light for pedestrians indicates that it is their right of way.