White triangles painted across a traffic lane indicate that you must?

Answer: B — Prepare to stop and yield to traffic

White triangles painted across a traffic lane serve as a yield line, which indicates that drivers must prepare to stop and yield to any traffic that has the right of way. When you see these markings, it signals that you are approaching an intersection or a point where you may need to yield to other vehicles or pedestrians. This is crucial for maintaining safe traffic flow and preventing accidents at intersections. Recognizing these markings is essential for understanding how to interact with other road users effectively. The triangles alert drivers to slow down and assess their surroundings, ensuring they are ready to give way as required.