Answer:
Involving all managers rather than delegating planning to a "planner"
Step-by-step explanation:
Strategic planning is a process of establishing the direction of a business. It assesses where the business is and where it is going. And the action plan needed to get to it's goal.
Delegating planning to a planner rather than involving all managers is an identified pitfall in strategic planning.
This is why Involving all managers rather than delegating planning to a "planner" is the correct answer since we are required to identify a non pitfall by the question.