Answer:
Confidentiality duty to Kim has been violated by Greg.
Step-by-step explanation:
Remember Greg is acting as agent or real estate agent to Kim.
According to law he owed a duty of confidentiality to Kim which involves not disclosing any information of benefit which he may have gotten from his client (Kim) to third parties (buyers) without permission from Kim.
Therefore, Greg was not suppose to mention that Kim would have accepted less for her home.