Final answer:
The situation that addresses the fiduciary duty of confidentiality is option C. Regina telling her seller client that he's required to disclose the roof damage.
Step-by-step explanation:
Out of the given options, the situation that addresses the fiduciary duty of confidentiality is option C. Regina telling her seller client that he's required to disclose the roof damage.
A fiduciary duty is a legal obligation to act in the best interest of another party. In this case, the seller client has a duty to disclose the roof damage to potential buyers, and Regina is ensuring that the client is fulfilling this obligation.
On the other hand, options A, B, and D do not directly relate to the fiduciary duty of confidentiality. Option A involves disclosing personal health information, which is not a matter of confidentiality between the agents. Option B involves sharing commission information, which may be subject to internal policies but is not necessarily a breach of confidentiality. Option D involves the lender sharing the borrower's financial information, which is a different issue altogether.