Which of these terms best describes a trained professional who specializes in helping individuals change behavior?

The term that best describes a trained professional specializing in helping individuals change behavior is counselor. Counselors are specifically trained to work with clients to identify and address behavioral issues, providing therapeutic support that facilitates change. They often utilize various techniques and interventions tailored to the individual's needs, which may include cognitive-behavioral therapy, motivational interviewing, and other evidence-based approaches focused on behavior modification.

While therapists and counselors share similar roles and may have overlapping functions, the term "counselor" is more broadly applied to those who provide guidance and support in changing a wide range of behaviors, from mental health issues to life decisions. A life coach may support behavioral change but is typically less focused on clinical issues and more on personal development and performance improvement. Advisors are generally seen as providing guidance in academic or career paths instead of focusing on behavioral change. Therefore, "counselor" is the most appropriate term within this context.