Most societies recognize ethical principles such as honesty, fairness (or justice), diligence, and respect for the rights of others. Duplicity, which involves deception, is generally in violation of these principles. Therefore, it is least likely to be considered an ethical principle.

• A (Justice): Incorrect, as justice is a widely acknowledged ethical principle.
• C (Diligence): Incorrect, as diligence is also commonly regarded as an ethical principle.