Final answer:
In line with classical organizational theory, a nurse should first discuss workload concerns with a team leader before escalating it to higher management, maintaining the organizational hierarchy and communication protocols.
Step-by-step explanation:
Using the classical organizational theory model, the most appropriate method for the nurse to voice concern over unfair client workload assignments would be to discuss the problem with the nurse's team leader and then the charge nurse if the problem remains unsolved. This approach aligns with the hierarchical structure and communication pathways outlined in classical organizational theory. It suggests beginning with direct supervisors before escalating the concern to higher levels of management, ensuring proper communication flow and respecting the organizational hierarchy.