The operator was commended for his dexterity.

The correct answer is D. skill.

Dexterity is the ability to use the hands and fingers skillfully and quickly. It is often used in reference

Cooperation is the act of working together to the same end. It is often used in reference to teamwork

Courtesy is the quality of being polite and considerate. It is often used in reference to manners or etiquette.

Punctuality is the quality of being on time. It is often used in reference to appointments or meetings.

In the given question, the operator was commended for his dexterity. This means that he was praised for his skill in using his hands and fingers. The other options are not relevant to the question.