Answer:
a. the environment is a dynamic one, and department and frontline managers can come up with more responsive plans than can central leadership.
Explanation:
If the organization is a dynamic system, it means that conditions change fast and often. In this case, a plan developed by top-management may not be adequate enough a month, or even a week later after being devised.
Therefore, it's best to allow frontline managers, who have knowledge about daily operations and conditions, to develop their own plans (with the assistance of the planning specialists), and to modifiy those same plans if needed.