Final answer:
You must always yield to a public transit bus with a yield sign on the back and signaling to enter traffic, irrespective of the number of passengers, time of day, or traffic conditions.
Step-by-step explanation:
When you are required to yield to a public transit bus with a yield sign on the back and is signaling to enter traffic, the answer is C) Always, regardless of traffic conditions. It is important to give way to these buses as they merge into traffic from a bus stop or shoulder of the road regardless of the number of passengers or the time of day. Not only is this a legal requirement in many regions, but it also helps ensure the smooth operation of public transit services, which can be crucial for managing traffic flow, particularly during rush hours.