The correct answer is D. Staffing.
Staffing is the process of filling and keeping the organization structure filled. It involves identifying the need for employees, recruiting and selecting the best candidates, and orienting and training new employees.
Planning is the process of setting goals and objectives, and developing strategies to achieve them.
Organizing is the process of creating a structure for the organization, and assigning tasks and responsibilities to employees.
Directing is the process of motivating and leading employees to achieve the organization’s goals.
Controlling is the process of monitoring performance and making adjustments as needed.