What does a green traffic light mean?

Answer: B — You may proceed if it is safe to do so

A green traffic light indicates that you may proceed if it is safe to do so. This means that vehicles can move through the intersection without needing to stop, assuming the way is clear and not obstructed by other vehicles or pedestrians. It's essential for drivers to assess the situation before moving forward, as they must ensure that it is safe to proceed—taking into account other road users, traffic conditions, and any potential hazards. The other options suggest conditions that do not accurately reflect the meaning of a green light. For instance, the requirement to stop if vehicles are present or to prepare to stop contradicts the indication given by a green light. Similarly, only proceeding when pedestrians have cleared doesn't encompass the complete message of a green light, which primarily encourages drivers to move unless there are immediate safety concerns.