The correct answer is (B) Standard of behaviour; moral principles; set of personal, moral, or cultural values. The body of moral precepts or values that govern the conduct of an individual or particular culture or group.

Ethic comes from Middle English etic, Latin ethicus, eticus, Greek ethikõs (character).

Examples of use:

• Many persons now question the ethics of CEOs of large corporations.
• Her ethics are beyond reproach.