In a jurisdiction where the common law of agency governs real estate activities, a broker has entered a single agency relationship with the buyer. The broker has put together a list of properties for the buyer to consider in order to earn a commission, but not all of these properties are suitable for the buyer's needs. In this case the broker has violated the fiduciary duty of

The duty of confidentiality requires the broker to protect the buyer's private information and not disclose it without consent. In this scenario, the broker's actions do not pertain to the confidentiality of information but rather to the appropriateness of the properties presented. Therefore, confidentiality is not the violated duty in this case.

The duty of disclosure involves informing the buyer about material facts related to properties and the transaction. While the broker may have a responsibility to disclose information about the properties, the primary violation in this instance is the failure to prioritize the buyer’s needs in the selection process, which ties back to loyalty rather than disclosure.

The duty of caution entails acting with care and diligence in the broker's professional responsibilities. While appropriate property selection is part of acting cautiously, the direct breach relates to the loyalty owed to the buyer. Thus, caution is not the specific fiduciary duty violated in this situation.