Answer:
B - Depend too heavily on the fees generated by the client or clients.
Step-by-step explanation:
The keyword here is one client or group of clients. Whenever any company becomes too heavily dependent on another company, for a greater portion of its total revenues, then it does not only raise an ethical flag, but also increases the risk of the firm. If the primary source of its total revenue is pulled out, the company has a high probability of becoming bankrupt.