Final answer:
Don is managing because he is carrying out the essential managerial functions of planning, organizing, leading, and controlling company resources to achieve the company's goals.
Step-by-step explanation:
Don is displaying key managerial functions to lead the organization towards its objectives. By planning, organizing, leading, and controlling company resources, and strategically involving his employees in the process, Don is managing. These activities are part of the core responsibilities of a manager. Management involves coordinating the efforts of people to achieve goals and objectives using available resources efficiently and effectively. While developing synergy and delegating are parts of what a manager does, these are actions within the managing role, not descriptions of the role itself. Therefore, the correct answer to the question "Don works diligently to accomplish the company goals in an efficient and effective manner, utilizing his employees through planning, organizing, leading, and controlling company resources. Don is ___?" is managing.