Which duty requires members to act for the benefit of their clients over their own interests?

The duty of Loyalty, Prudence, and Care emphasizes the obligation of members to act in the best interests of their clients, prioritizing their needs over personal interests. This principle is foundational in the realm of investment management and fiduciary responsibilities, as it ensures that clients receive unbiased advice and services that are genuinely geared toward their financial well-being.

By prioritizing loyalty, practitioners commit to placing the client's financial interests first, which means avoiding conflicts of interest and making decisions that may not maximize personal gain but instead focus on the client's goals and needs. Prudence and care further underline that members should apply sound judgment and diligence in managing client assets, reinforcing the responsibility to not only act loyally but also competently.

In contrast, the other options represent important ethical duties, but they do not encapsulate the specific requirement to place client interests above one’s own. Fair Dealing relates to how clients are treated in terms of fairness and equality, while Preservation of Confidentiality focuses on maintaining the privacy of client information. Performance Presentation deals with the accurate representation of investment performance, which is essential but distinct from the relational aspect of prioritizing client interests.