Final answer:
A manager performs the task of Leading when they energize employees and help them understand their role in achieving organizational goals.
Step-by-step explanation:
When a manager energizes employees and enables them to understand the part they play in achieving organizational goals, the task they are performing is C) Leading. Leadership involves inspiring and motivating team members, communicating the vision of the organization, and guiding employees towards the fulfillment of the collective objectives. This is distinct from tasks such as planning, organizing, or controlling, which are also essential managerial functions but serve different purposes within the management process.