Answer: C. Technical skills
Explanation:
Technical skills are more practical skills that are needed for practical assignments. As Barry is now a mid-level manager, these skills are the least important to him.
This is because his work now requires more of him using his head so to speak. His work is now more conceptual because he has to set priorities and ensure that they are met as well as coordinate the activities of his department.
He also need to have more human skills to enable him build a strong and motivated team. These are the more required skills as opposed to technical skills.