In NPPE terminology, ethics refers to the systematic study of morality—principles and values that guide what people ought to do. It addresses questions about right and wrong conduct, good and bad actions, fairness, integrity, and responsibility, especially where rules do not give a complete answer. This is distinct from law: laws are enforceable rules established by governments, whereas ethical obligations can be broader than legal minimums and often focus on professional duties to the public, clients, employers, and the profession. “Duties” (C) relates more specifically to deontology (duty-based ethical theory), which is one approach within ethics rather than the definition of ethics itself. “History” (B) is unrelated. Professional ethics in engineering/geoscience uses these moral principles to shape expected conduct—such as holding paramount public safety, acting with honesty and integrity, avoiding conflicts of interest, maintaining confidentiality where appropriate, and practicing only within competence. Therefore, the best definition is that ethics is the study of morality (A).
