An agency relationship in real estate is terminated in multiple ways. All of the following are likely to be the cause of termination of an agency relationship, except:

Agency relationships are fundamental to real estate transactions, creating legally binding obligations between parties. This question tests understanding of how these relationships can end, which is crucial for agents to avoid unintentionally continuing relationships that expose them to liability. The question's core concept centers on termination methods, requiring knowledge of both automatic and voluntary termination scenarios. To solve this, we must analyze each option against agency termination principles. Option A is tricky because while death typically terminates agency, California law has specific provisions regarding broker's death that don't automatically terminate the relationship. Option B represents voluntary termination through revocation, a valid termination method. Option C demonstrates objective impossibility, which automatically terminates agency. Option D, estoppel, prevents a party from denying facts that were previously established, potentially terminating an agency if relied upon. The challenge lies in understanding nuanced exceptions to general termination rules, particularly California's specific statutes regarding broker death.