The ethical value of "Integrity" is best described as:

Integrity is the cornerstone of ethical conduct. It means consistency of actions, values, methods, measures, principles, expectations, and outcomes. It involves being honest and having unwavering adherence to a strong moral and ethical code, even when no one is watching. While intelligence (A) and efficiency (C) are valuable professional skills, they are not synonymous with the moral character implied by integrity. Option D relates to sociability, not ethics.