Final answer:
Screening telephone calls is primarily done to manage call volume effectively, allowing for prioritization and better workflow management.
Step-by-step explanation:
The primary goal of screening telephone calls is b. Manage call volume effectively. Screening allows individuals or businesses to prioritize calls, ensuring that they respond to the most important or pertinent calls first while minimizing disruptions and managing their workflow. This practice has become more relevant due to factors such as the increased use of caller ID, the hectic nature of personal schedules, and the decreased willingness to be interviewed. Screening is not intended for entertainment, avoiding all calls, or scheduling appointments randomly, rather it is a technique used to handle incoming calls in an organized manner.