The correct answer is C. Staffing.

Staffing is the process of acquiring, developing, and maintaining a workforce that meets the organization's objectives. It includes activities such as recruitment, selection, orientation, training, and development.

Recruitment is the process of attracting and identifying qualified job applicants. Selection is the process of choosing the best candidate for a job from a pool of applicants. Orientation is the process of introducing new employees to the organization and its policies and procedures. Training is the process of teaching employees the skills and knowledge they need to do their jobs effectively. Development is the process of helping employees improve their skills and knowledge over time.

Staffing is an important managerial function because it ensures that the organization has the right people with the right skills to do the right jobs. It also helps to ensure that the organization complies with all applicable laws and regulations.

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 to employees. Controlling is the process of monitoring performance and making adjustments as needed.

Planning, organizing, and controlling are all important managerial functions, but they are not directly related to staffing.