The trait of a good leader that causes them to have a deep concern for others is their sincerity.
A leader is a person who is in charge of the efficiency of others and who motivates others for their jobs. A good leader is one who is concerned for others.
The trait that represents a leader's concern is his sincerity. A leader who is sincere and honest towards his work is more likely to be appreciated.
Therefore the correct option is D.
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