How does planning help managers in dealing with changes and uncertain events?

By anticipating and developing responses

The correct answer is option 2 i.e. By anticipating and developing responses.

Planning is an activity which enables a manager to look ahead and anticipate changes. By deciding in advance the tasks to be performed, planning shows the way to deal with changes and uncertain events. Changes or events cannot be eliminated but they can be anticipated and managerial responses to them can be developed.