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 principal.
B) The principal losing the authority to contract as a result of the principal's death, insanity or bankruptcy.
C) The performance of the agency becoming impossible.
D) The principal giving notice to the agent.
E) All of the above.