Perry tells Jaime that Selena has agreed to allow him to sell her high-end trial bike. Selena is present at the time, hears the conversation, and says nothing. Jaime wants to buy a bike like Selena's so he agrees with Perry to buy her bike. Selena then refuses to sell it. She claims she is not bound by the agreement formed by Perry and Jaime because Perry is not her agent. Selena is: a. not bound by the contract because she did not have an agency agreement with Perry. b. bound by the contract under a theory of agency by estoppel. c. bound by the contract under a theory of agency by operation of law