Concept:Integrity is the quality of being honest, truthful, and morally upright at all times.
Explanation:The quotation lists behaviours that define a person of strong moral character.
Being truthful to oneself means acting honestly without deceiving your own conscience.
Being truthful to others shows fairness and sincerity in dealing with people.
Being someone others can trust means the person is reliable and dependable.
Doing what is right regardless of circumstances shows firm moral conviction even under pressure.
Together, these qualities are the core marks of integrity.
They do not mainly represent selflessness, which is putting others above personal interest.
They also do not represent diligence, which is hard work, or discipline, which is self-control and order.
Therefore, the correct option that matches the quotation is integrity.
Answer:D. integrity