Which of the following is an example of a professional membership organization?

The correct answer is the American Counseling Association (ACA). This organization is specifically focused on the needs and interests of professional counselors, providing resources such as professional development, ethical guidelines, and advocacy for the profession. Membership in the ACA allows counselors to connect with peers, access training, and stay informed about best practices in the field.

In contrast, while the American Psychological Association (APA) does serve as a professional membership organization for psychologists, it encompasses a broader range of specialties that may not be solely focused on counseling. The National Institute of Mental Health (NIMH) is primarily a research organization that focuses on mental health research and does not serve as a professional membership entity. Similarly, the National Association of Social Workers (NASW) focuses specifically on social work professionals rather than counseling as a distinct field. Therefore, the ACA stands out as the organization dedicated specifically to the counseling profession, which solidifies its position as the correct answer in this question.