Final answer:
You must always yield to a public transit bus with a yield sign on the back and signaling to enter traffic, regardless of traffic conditions.
Step-by-step explanation:
The question pertains to traffic laws regarding yielding to public transit buses. As per the traffic rules in most regions, you are required to yield to a public transit bus that has a yield sign on the back and is signaling to enter traffic. The correct answer to the question is B) Always, regardless of traffic conditions. This law is designed to facilitate the smooth integration of transit buses into traffic flow, ensuring their timely operation and enhancing the overall efficiency of public transportation systems.