Which of the following is NOT one of the six fundamental principles of accountancy?

The correct choice reflects that "Efficiency" is not one of the six fundamental principles of accountancy. The six principles typically recognized include integrity, objectivity, professional competence and due care, confidentiality, professional behavior, and the provision of accurate and timely information.

Integrity refers to the obligation of accountants to be honest and forthright, maintaining trust in their profession. Confidentiality emphasizes the importance of keeping client information private and only disclosing it when legally required or with consent. The principles are designed to guide ethical behavior and ensure that accountants adhere to the highest standards of professional practice, focusing on maintaining the trust of clients and the public.

In contrast, "Efficiency" while an important quality in business operations, does not align with the ethical principles established for the practice of accountancy. It does not encompass the ethical obligations of accountants in the same way that the other principles do. This distinction clarifies why efficiency does not belong on the list of fundamental principles in the field of accountancy.