Answer: (A) Skilled labor
Explanation:
The skilled labor is one of the type of labor who has specialized in their specific skill domain and knowledge.
The skilled labor basically refers to the worker that who invest high on their education and training. They can perform various types of complex tasks and also operate the equipment with high complexity but with the supervision.
On the other hand, all the options are incorrect as the professional labor do not need any supervisions because they are already professional with their task.
Therefore, Option (A) is correct.
