Which body investigates ethics violations at the national tournament level?

The Board of Control is responsible for investigating ethics violations at the national tournament level. This entity is specifically designated to handle matters related to adherence to the rules and standards of conduct expected within the sport, especially during high-stakes events like national tournaments. The Board of Control has the authority to review incidents, gather evidence, and render decisions regarding any ethical breaches.

The other choices serve different functions within the structure of golf governance. The PGA Sections typically manage regional affairs and are concerned with local member activities rather than national-level ethics violations. The Board of Inquiry, while it may handle investigations, is not the primary body for ethics at the national level. Lastly, the Membership Committee focuses more on member eligibility and benefits rather than direct investigation of ethics violations. Thus, the structure of the PGA assigns the critical task of overseeing ethics violations at the national tournament level specifically to the Board of Control.