What are reasons the line manager should take the primary role in defining work?

Question

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The line manager, being responsible for the day-to-day operations and supervision of their team, has a better understanding of what duties need to be performed to achieve organizational goals and what skills and knowledge are required for the job. Therefore, they should take the primary role in defining work. Choices A, C, and D partially overlap with B and are not specific enough to justify the line manager's role in defining work.

What Are Reasons the Line Manager Should Take the Primary