Avoiding unprofessional, dishonourable, or disgraceful conduct is a cornerstone of maintaining the reputation, integrity, and trustworthiness of the profession. NPPE ethics discussions commonly group duties into obligations to the public, clients/employers, colleagues, oneself, and the profession. Conduct described as “dishonourable” or “disgraceful” is typically framed as professional misconduct because it undermines public confidence in regulated practice and damages the standing of engineers/geoscientists collectively. While such behaviour can also harm clients or colleagues in particular cases, the ethical duty most directly engaged is the duty to the profession: upholding the dignity, honour, and integrity of professional practice; complying with the Code of Ethics; and behaving in a manner that sustains trust in the self-regulating system. Thus, option D is the closest match.