The One Factor That Is Not Relevant for Company Managers

The one factor that is not relevant for company managers to worry about when their company has many unrelated firms,especially when they are very diverse is to

A) stay abreast of what's happening in each industry and subsidiary.
B) pick business-unit heads having requisite combination of managerial skills and know-how to motivate people.
C) understand the true value of strategic investment proposals by business-unit managers.
D) know what to do if a business unit stumbles.
E) rely on the skills and expertise of business-level managers to build competitive advantage.