Final answer:
The appropriate time to notify the BC immediately if a change in the Telestaff company roster occurs is option C) 8:00 PM.
Step-by-step explanation:
In the given options, the appropriate time to notify the BC immediately if a change in the Telestaff company roster occurs is option C) 8:00 PM. This is because the option represents a reasonable timeframe that still allows for prompt notification to the appropriate BC. The other options, such as option A) 12:00 AM or option D) 5:00 PM, are either too late in the day or too early in the morning.