In the Absence of Some Specific Contractual Requirement, an Agency

In the absence of some specific contractual requirement, an agency arrangement may be terminated by

A) the agent giving notice to the third parties it has contracted with for the principal
B) the principal giving notice by newspaper advertisement that the agency relationship is over
C) the principal and agent disagreeing about any issue whatsoever
D) the performance of the agency becoming more difficult than first imagined
E) the principal giving notice to the agent that the agency agreement is terminated