Step 1: Define Staffing.
Staffing encompasses the recruitment, training, and placement of suitable personnel within an organization.
Step 2: Evaluate Components.
- Training: Integral to staffing, preparing employees for their responsibilities.
- Authority: Pertains to the delegation of decision-making authority, not a direct component of staffing.
- Recruitment: A critical staffing function, involving attracting potential candidates.
- Selection: Another key staffing element, focusing on choosing qualified applicants.
Step 3: Deduce Conclusion.
Authority is the element not directly involved in staffing; it relates more to organizational management structures.
Final Answer: \[\boxed{\text{The correct answer is (2) Authority.}}\]