Final answer:
The correct answer is 'sphere of influence,' which refers to a group of potential clients an agent can influence or engage with for opportunities.
Step-by-step explanation:
A list of prospects regularly contacted by an agent in the hopes of making them clients is called a sphere of influence. This term refers to a group of individuals or businesses that an agent can potentially influence or engage with, often through past business interactions, social connections, or referrals. In the context of job searching, these connections may not directly have job opportunities, but they may offer valuable information or further connections, such as introducing a job seeker to professionals within their field. It is important for job seekers to leverage their sphere of influence, as it could lead to future client relationships and opportunities.