The operator was commended for his dexterity.

Answer: Option D

Cooperation : the action or process of working together to the same end.
Courtesy : the showing of politeness in one's attitude and behaviour towards others.
Punctuality : the fact or quality of being on time.
Skill : the ability to do something well; expertise.
Dexterity : skill in performing tasks, especially with the hands.

Synonym of Dexterity is Skill