Answer: Option D
Explanation: In simple words, controlling refers to the function of management in which manager sets the standards of performance, compares the performance with the standards and take corrective actions in case of any discrepancy.
Controlling helps the organisation to achieve its goals by making the employees working towards the same goal determined in the planning stage. Controlling sets the standards of performance for the employees which works as a guide in their job.
Hence the correct option is D.