Concept:Devotion of one’s whole self to a worthy cause or person is called commitment.Explanation:Commitment means giving yourself completely to a person, group, or cause.It is done especially when that person or cause is worthwhile or valuable.Delegation means assigning work to others.Hard work means putting in great effort.Comportment means good behaviour or conduct.Only commitment matches the idea of devoting oneself completely to something worthwhile.Answer:D. Commitment.