Final answer:
In situations where a driver loses sight of their backer or guide, the safest action is to stop the vehicle and wait. If possible, they should then contact the backer for further instructions. Safety is the top priority in such scenarios.
Step-by-step explanation:
The scenario described seems to be referencing a situation in which communication and safety protocols are involved. The correct course of action when a driver loses sight of a 'backer' or anyone providing guidance would be similar to what one would do in a safety-critical situation. It's important to stop the vehicle and re-establish visual contact or communication before proceeding. This ensures the safety of all parties involved, including pedestrians and other drivers. In the provided options, the appropriate action would be to stop the vehicle and wait for the backer to reappear. If applicable, the driver should then call the backer to ask for directions or further instructions. Continuing to drive without visual contact or going back without certainty could pose potential risks.