Which of the following is NOT a way an agency relationship can be terminated by the parties?

An agency relationship can be terminated in various ways, including completion, expiry, and mutual consent. However, the specific choice identifying incapacity as a way to terminate the agency relationship does not apply to the context of termination by the parties involved.

Completion refers to the successful fulfillment of the purpose for which the agency was created, such as the sale of a property. Expiry indicates that the agency agreement has reached its predetermined end date or has naturally concluded. Mutual consent allows both parties to agree to terminate the relationship voluntarily.

Incapacity, while it might affect an individual's ability to act as an agent, is generally focused on situations where one party is unable to fulfill their duties due to circumstances beyond the control of the parties themselves (like mental incapacity or death), rather than a mutual decision by the parties involved to end the agency. Therefore, it is not considered a method through which the agency relationship can be actively terminated by the parties.