The management function that requires managers to ensure that various departmental activities are coordinated.

a. controlling

b. planning

c. directing

d. constraining

The correct option is c. directing

Directing is the process of guiding the various department and their activities in order to achieve business objectives. In directing the manager's guide, teach and supervise the performance of the different departments. After the directing process, the business finds out the performance and implements measures to improve the performances. The various department's activities are coordinated as per the directing function.

The explanation for the wrong option

a. Controlling: It is the process which is followed by the business to oversee the performance of the business and take necessary measures to solve the problems in it. So it is the wrong option

b. Planning: it means the first step taken by a business to achieve the business goals. So it is not the right option.

d. constraining: It will not help to coordinate the various departments of the business. So it is the wrong option.