Kyrie Negotiated a Contract in Good Faith with a Party

Kyrie negotiated a contract in good faith with a party whose introductory letter from his employer reasonably led her to believe he had the proper authority to do so.What would be the most likely outcome of any dispute challenging the existence of an agency relationship?

A) The law sides with the principal through ratification.
B) A court will determine the agent had actual authority.
C) The law sides with the customer through estoppel.
D) A court will determine the agent had apparent authority.